Solution to the Grandfather Paradox
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- čas přidán 12. 05. 2016
- What if you went back in time and killed your own grandfather? Would you still be born? Or would you have thus killed yourself? Thanks to Google #sciencegoals for sponsoring this video!
Link to the previous MinutePhysics video: • Solution to the Grandf...
If you could travel back in time, and you killed your grandfather, would you be killing your future self? What do physics, complexity theory, and computer science have to say about this famous murderous time-travel paradox?
Scott Aaronson Notes that discuss time travel and computation, computational complexity, closed timelike curves, and the grandfather paradox: www.scottaaronson.com/democrit...
Technical paper that discusses the same thing: arxiv.org/abs/quant-ph/0502072
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This would be the worst way to find out you were adopted.
One of the cleverest comments 😂.
@@neatchip123 oxidation reduction need add complex law theory physics
Lmao
😂😂😂
Lmao
_brain.exe has stopped working_
lolllll
+TheGamerMan757 Have you tried turning it off and turning it on?
Mind blows up like the Death Star
+TheGamerMan757 "Process BRAIN.DLL halted unexpectedly"
I get that error a lot on these videos. Still waiting for a patch :(
+TheGamerMan757 reloads brain.exe and uploads understanding.exe to brain.exe and saves brain.exe
I think that, the most "practical" solution would be that the moment "you" leave your current timeline and so become a "time traveler" then you become immune to this kind of paradox. As soon as you leave your own timeline for the first time, you do not belong anymore to that timeline and not to any other timeline either. You basically become a timeless entity.
So, you going back in time to kill your grandfather, would just result in killing your entire family except of you. If you then would get back on your original timeline, your family won't be there anymore, and never have been, but you would still be there.
Another solution would be that "the universe always finds a way". So, if you go back in time and kill your grandfather, then you won't be born and so, "someone else" would be born, and that someone is the one that actually goes back in time to kill you grandfather. If you do not kill your grandfather, then this other "someone else" wouldn't be born.
After 20 minutes of reading the comments i think this solution is the best one yet
I like that idea. To add to it I personally think there are an infinite amounts of timelines and if you time traveled to kill your grandfather, you simply end up in one of thosr timelines and murder him and it would have been his fate to die by your hands and like you said you'd end up still being alive but as a timeless entity.
@@NazirLer Actually, the most practical solution is that the past does not exist. There is no place to go to. The future also does not exist.
There is only the now. The ever changing present.
For one thing, the Law of Conservation of Energy should prevent all time travel anyway.
But with the concept of only the ever changing now existing, all time travel paradoxes do not exist because time travel itself does not exist.
If this is true in reality, then there might not be other dimensions and there definitely would not be other times.
Time would then not be a dimension like many people view it. We would still have the abstract concept of time that we use, but it wouldn't really exist in reality. Viewed mathematically, time would be a point, not a line.
i think you are right on the first half of what you say. Which i think is how they explained it in endgame. Your past is your past. It's already happened. Going back to the past and making changes is in your future. So you were born, you went back to the past, killed your grandfather - but you'd still be there. Wether you stayed in the past and just lived to the present - or if you time traveled back to the present.
I like both of these. My solution is that when you go back, the universe itself prevents a paradox by making it impossible for you to kill your grandfather. Kind of like a "Final Destination" in reverse.
You could argue that if you did have access to a time machine, it is impossible to kill your grandfather because you already failed. Many people forget that if something happened or didn't happen in the past, then it must stay that way because that moment was solidified into history. You can't "go back and change" the past. For example, if you went back and talked to your past self, then you would have already experienced that at a younger age.
@SillySyrup
That brings up another question.
If you were visited by your future self, and he said that you will create a time machine and travel to talk to your younger self when you get order, do you have a choice?
Can you avoid creating a time machine and do something else?
if you did that, then your future self wouldn't have been able to talk to you when you were young, and thus no time travel.
@@stardrake691 No, you wouldn't have a choice. That means that you would think about it and decide to create it eventually.
So you just really can't break through it?
@@itsnotderryl Not exactly. No magic force is stopping you. However, some plausible, physical force will stop you from completing the goal. Like I said, you've already failed.
@@SillySyrup ohh
The easy answer: Two timelines
The hard answer: this video
The complicated lore answer: You ARE your grandfather
Good one
What?
@@obviously1429 Futurama, that's what.
“I did do the nasty in the past-y”
what if i was a test tube baby?
Someone complained about something about this comment, now no one shall know what it originally was
haljoa fuck this is genius
*slow clap
*insert funny pun here*
he wouldnt be killing his own grandfather then right?
if that were to be the case ur life would still dramticly change because if u kill the grandfather of the person who adopted u then the person who adopted u wouldntv of been born therefor u wouldnt of been adopted by that person meaning u would be adopted by someone else. assuming that there is another person who adopts u witch would most likely be the case but since we dont acctuly know then anything could happen. i guess.
Another solution: each time you travel to the past, your grandfather is moved to the future.
Wait shit thats genius-
WELL IMMA KILL MA DAD
Wait wha-
That's kinda just the multiverse explanation though
Wait i didn't get it what ?!
You can't go back in time, you can only go forward.
well actually in the ringluraty basically a singularity but a ring in a spinning black hole alows infinite speed ftl makes time travel
They always say "What if you killed your Grandfather"
But they never say "Why would you kill your Grandfather"
😔
Reality is often disappointing 😔
Hmm..."How would you kill your Grandfather"..
Just saying...
*_Why not?_*
Well, for example if you realized your original family name was Hitler :D
solution:
you are now a murderer
Achievement Unlocked! xD
Greg Williams solution nothing ever happens and it loops again and again unless some other time traveler comes and tells you you created a paradox
Gamerale2006 so if a random person tells you cool you just created science! you will stop murdering grandpas?
idk his choice he can either continue forever or realize the dumb mistake he made
If you killed your grandpa then wouldn't your grandma end up with someone different, which then ends up with your parents being different, which then in turn only makes you look like a different person then you were?
Both of the solutions you used involved a different form of time than the paradox uses. The first one, you used was the one where you travel back in time, and that creates a new reality, the second one, was the one where there are two interconnected reality’s, where your actions in the past, only effect one reality. The grandfather paradox, uses the form of time travel, where there are no others reality’s in existence, or that can be made. If you use a different form of time, it’s not actually the grandfather paradox, it’s not even a paradox.
Why does it have to "create a new reality"? Can't you just travel to an already existing universe?
If you can imagine all of the possible timelines already existing and we are just in one of them THEN time travel could be seen as BOTH time travel and universe travel. So you can not co back in your OWN timeline but you can go back in in time in a timeline that is near ours. In the 2nd timeline you do not get born because you killed your grandfather in that one. There are still billions of timeline where you are born and billions more where you are not but only one has your existence removed based on your actions.
@@claytoncourtney1309 two different ways to look at what you are saying, one still being that you create a new universe (reality). And if you are travellinh to a separate universe, then you arent actually killing your grandparents, you arw killing somebody else's grandparents causing no effect. I cant explain exactly how it works, but you cannot travel into a different reality, that is in a different time line. Another way to look at what you have said with the timelines, is that you go back in time and alter the timeline through killing your grandparent, two different things that could happen is either the exact same paradox, or creating a new time line in which you dont exist, but for that to happen you must have survived in your reality meaning that the grandfather paradox not happen.
I like to imagine that a time machine would only be able to place you back in time on a path that does not create a paradox. After all, it must be able to “see” into the past. You could do anything you want except things that result in you or the time machine not existing. This creates interesting story possibilities, like you fail to kill a villain & later learn he was your own great-great-grandfather, so of COURSE you failed.
I had a found a few errors in your understanding; however over all you are somewhat correct
I'm totally kidding, I have no idea what is happening in this video
lol
This comment will have me laughing for days.
L O A D I N G...brb after 10 years
lol
lool
After watching tenet, youtube recommends grandfather paradox.
Yeah😂
Same here😂
Yea youtube knows maybe u have wached tenet explained videos om ytb and the alghoritm knows what u wach and recomends this video
Same
Same here
Another Paradox: If Pinnochio said "My nose will grow now", What happens?
his nose grows after an amount of time, so the 'now' part is false but the nose still grows
@@jan_Masilijun What about "My nose will grow soon"?
@@Nathan-qq3mt his nose grows after a very long amount of time
I think I have the answer!
If Pinocchio had the ability to predict the future, then he would know what he was talking about. But when he says something based on nothing, it doesn't mean anything. It cannot be considered a lie if he himself does not know what the truth is, therefore it is only a statement.
But let's say Pinocchio has the ability to predict the future and he says the same thing, in this case his nose will grow because that's what he sees. But probably for another reason unrelated to the lie, just to make this prophecy come true even though no lie was told. They will find another reason for this to happen, a whole plot will be created about this strange phenomenon.
I believe what would happen is that your grandfather would die and then you would continue existing. So if you were to go back to the present then you would spontaneously appear out of nothing. The way I look at this is to look at the timeline as some sort of word document. The original text said that your grandfather survives, but then you went back in time and made an edit. I don’t really know how to express this theory, it’s hard to put it in words. Another way to look at it is the following scenario. There is a division of soldiers and their major general orders them to attack a nearby enemy base. Then the major general decides to at the enemy base is too well defended and orders the soldiers to retreat. Which order will the soldiers listen to. The most recent one.
It is funny to imagine people watching you appear out of thin air 😂. We can say it is sort of like "overwriting" your past. If you time travel to the past, it becomes your new future, where you co-exist with the past people and become a part of your past. But idk how all this would affect a person's age? Would it remain the same or increase according to how far back you time travel to. This stuff is pretty crazy tbh.
@@electrocubic5116I think it would just remain the same. Like you would age at the same rate
Just call it, Schrodinger's Grandfather.
I thought i was the only one....
ya thought of that myself today.....gdaddy exists and doesn't :)
Soham Dutta grandpa is both alive and dead but when you check him which outcome is it
appart for Shrödingers Cat not working like this... sure
"Back in my day, we existed in only one time loop, forward through time both ways, and we didn't complain!"
I was explaining this to my friend and his grandfather walked in🤦🏻♂️
I know you are lying son, don't worry your secret is safe with me
@@omega-man1736 😂
Lol
Kill the grandfather
Awkward!
You know you’re old when a small kid shoots you saying you’re his grandad.
I had 3 solutions to this paradox.
1. When you travel back in time you create another timeline
2. When you travel back in time, you travel as a ghost so that you can't interfere with the past.
3. Anything you did in the past couldn't interfere with critical situations that happened already in the present because it was already destined to happen, meaning you would always fail trying to kill your father by whatever you tried to do because that would change the destiny...
Of course the other solution was that the future could be change like you told in the beginning
I'm creating a fictional universe where backwards time travel is possible, and I'm going with your #2. It or something similar to it seems to be the only logical way to make it work without creating multiple timelines or sacrificing free will.
4. You're adopted
There are NO paradoxes. You're born, a living being with cells and organs, your parents or grandparents being alive or dead has no bearing on whether you exist or not because you already do. Let's say, you go back in time to kill your grandfather. Your grandfather would die but you simply won't vanish. The collection of cells that is you will still be there.
Let's say you travel back to your own time now, your family just wouldn't exist nor would the world know you exist. Just a man with no paper trail or documents appeared out of nowhere. There wouldn't be another YOU either that can come up and stop you because, in this singular timeline, you're the only you that exist. This leaves no room for paradoxes.
Of course, there might be many things I might have not considered but feel free to discuss them with me.
It doesn't create a paradox, it just makes you a shitty grandchild
@@hasnaindevyou really gave a generic explanation without considering any time travel or time
Solution: *Why the fuck would you kill your grandfather?*
Rohanjeet Das memes
Chutiya sala
Perhaps the grandfather acted badly to you.
Rohanjeet Das Yh xD
Rohanjeet Das for the lols
today I woke up and said to myself, " I will not learn any physics today" and what do you know...
I still didnt learn any physics
Yay summer!
Haha! Fuck you school (even though you're a privilege and I do enjoy you quite a lot at times but still fuck you)
you're god damn right!
DerpMonsterProductions h
DerpMonsterProductions i
Heck man, you explained this so much better than I could!
That's such a good explanation bro. Loved it truly. Everything's clear by now. ❤️❤️❤️
GrandFather is dead and alive at the same time,
Schrödinger's CAT : Ah Shit, Here we go again!
Finally a worthy opponent
:(:
It's funny he threw away the logical solution of "it's a different timeline" just to give the same answer by they're both timelines at the same time, wich is basically the same. And just another version of the cat, yes🤔
@@shiaeliminator6484 It's you diferent situations. In first one the two timelines are independent and in the superposition one they are related. It's not that there ate two timelines but only one in two simmultaneous states. If you interact with one state the other will be affectef too (from a quantum physics point of view).
Watch Dark ,, you can understand it ,,
I love how the mathematicians try to solve a problem that isn't even possible
Hi everyone. I happen to have quite a paradox that would fit in this video and I would gladly share it with you.
We have a murderer in the dark ages and he is caught. It is sunday and the murderer stands in the courtroom to hear his sentence. The judge tells him that he will be hanged the next week, between monday and sunday. The judge also tells him that the morning of his execution he can not know for certain that he will be hanged that day.
So we have two conditions:
The murderer WILL BE hanged the next week between monday and sunday.
And he CAN NOT know for certain, on the morning of his execution, that he will be hanged that day.
@@jhwhthemerciful my man gotta guess when hes gonna die
Time travel is possible according to the laws of physics
Ne Dom activities
@@jhwhthemerciful that's a weak paradox and more of an inconvenience
I love how mathematician try to solve a problem that will be never be a problem.
I love how I just used this exact theory in an argument in the comments of a short trying to explain why this exact scenario plays out in a science based TV show I watch.
This is what Avengers Endgame was trying to do
Yo was waiting for this comment
@@user-cy5hz6tj9c i think dragon ball z used similer concept.where you can't change the past..
@@user-cy5hz6tj9c Endgame established going out of the grand father paradox by creating an alternate reality. Loved it
Endgame use Multiverse concept instead of this “Back to The Future” concept
They should've brought Tony back with the gauntlet. But contracts or whatever
This guy messed with my brain for 2 minutes and 48 seconds straight.
Even the Google supporting at the end?
Really? For me it was. Really interesting
hey look at my dp
You haven't seen "dark" have you?
no only 2min and 47 seconds😁
So how would you trace the two timelines forwards from the loop? It sounds like the time-traveler from the timeline where they are alive would return to their own timeline where the murder never happened, while the other would continue on without grandfather or time traveler.
I ask because I've heard of a similar story, but where the time-traveler went back to kill someone who killed their daughter; thus the time traveler exists in both timelines. Would the version of the time traveler who went back return to their own timeline where their daughter was still killed, while their counterpart from the timeline where the daughter was saved continues in their own timeline because they never went back?
Your right. The correct ways to solve paradoxes is redefining the possibilities of reality. Kind of like how the alternative timeline solution does. That you said is just avoiding it.
I went back in time to kill my neighbor but I started dissapearing from the timeline.
Its impossible. You won’t die at all. Didn’t you understand the beginning of the video? The grandfather paradox is wrong.
@@AceDeclan r/woooosh
@@AceDeclan oh ok
I get your gist. But that is nasty.....
Daltira I think your just trying to cover up your stupidity
A more interesting paradox is one where you time travel back a second time to stop yourself from doing something that you did the first time you time travelled
Like i go to slap someone but future me stops me so i would automatically go back to the present but i would still slap that person
That is the plot of a great Science fiction short story by Alfred Bester, titled "The Men Who Murdered Mohammed." I highly recommend it.
like when flash goes back in time to stop himself going back in time and saving his mother's life.
Also "Primer" is another great movie with similar intricated scenario
yup, was done in the show called the flash
I've already solved this theory, it took me 2 weeks to solve actually, and now i am planning write an article about it, great video btw👍
So, it's like schreningers cat, except it's your grandfather
why has noone else brought this up
also its Schrödinger's cat
@@theanomynusguy oh thanks
He says alternate timelines are boring as a solution and he won't do it, then he goes on to explain an alternate timeline.
It's the same timeline just with two different states. To give a metaphor as an example alternate time line are two separate coins. while his superposition timeline is the different sides of the same coin that's constantly spinning. Since the grandfather and grandson are constantly switching between existing or death the coin never lands .
What's up with all this people with letters has their youtube image?!!?
João Miguel
If you do not have an image thumbnail, Google+ will take the first letter of your username and use that instead.
+Wayne Hayes ...except it isn't "switching" between states; they're simultaneous, so it's logically equivalent to his original "boring" (his word) "solution" (not a solution, because it isn't actually a paradox to begin with).
You are right. It must be this duality crap they teach them at university... they don't seem to understand its a joke... they're taught that an electron is a particle... and that light has a speed... this is why time stops at light speed... There is no such thing as a paradox... I'm not going to answer weirdos that can't spell... or define a field... (I've made an edit as I don't want morons trolling me when all of this was answered before anyone on youtube was born) No I'm not going to offer anything new... Isaac Newton defined the field with his book Opticks... I have already credited him... All his equations are proved... e=mc2 falls apart with the cosmological constant meaning that c is not the speed of light... and its certainly not a proved equation... Relatively speaking folks these people are full of hot gas and fusion... Maxwell House was a brand of coffee that made people crap in the eighties... I'm not even going to argue with crap equations... Their math stinks... If they wanna post any proofs on here let it rip because its going to fall apart like a resolved fart... space time sounds like an event which comes after a fart... I'm not sure I need to define time that way... If relativity and fusion were to be believed there would be no Sun it would have been a brief spark following an explosion... And there would be no light...
TENET people what’s up
Ayyyyu
Wazzzup
I did not understand that movie at all
@@Titankiller-fz4tn it's not as complicated as Dark...
@@Titankiller-fz4tn me either
The thing everyone seems to never consider is that time moving in one direction and time travel to the past don't have to be mutually exclusive concepts. One moment you are in the present and the next future moment you are in what YOU consider the past. For the universe, it's a reordering of particle states to a state it previously held. It's like going back to an earlier point in a movie. You aren't causing the movie to go back in time, you are resetting a previous state.
So you step into a machine that resets the universe to a previous state, kill your grandfather and now a "current" version of you is never born. No problem. Time moves forward as it never ceased to do at any point during any of this. The date and time that you initially traveled back in time arrives with no new you to once again go back in time. Time continues to move forward with no paradox.
The universe has no need to consider the human desire for time to create a loop. Time remains a strait line.
Making the grandfather paradox is just forming a closed shape in 4-dimensional space and pushing a dot through it until it finds the end. Since the shape is closed there’s no end of the line and therefore it goes around infinitely. I theorise this creates a secondary “sheet” of space time that’s simply all the area you existed in forming the paradox, then once a single loop has been made you erase the whole timeline and that causes the original space time to return and start the second timeline. So they exist separately like two lights that flicker after the other stops flickering.
There's also the Novikov Self-Consistency Principle, which basically states that no paradox can happen. If you go back in time, everything you do will be consistent with history. Any attempt to influence events merely causes them to play out exactly as they did in the past. So you would be unable to kill your grandfather no matter how hard you tried. That event never happened, so it can't happen.
Yeah I like this one too, have heard of it! Thanks for reminding me! 😀👍
Like in Harry Potter and the prisoner of Azkaban.
@@OmniCroissant You may be interested in the fan fiction "Harry Potter and the Methods of Rationality" then. It's sort of a "What If" alternate story, and at one point he conducts experiments using the Time Turner and concludes that the timestream is self-consistent and no paradox can occur.
I don't understand why this even is paradox. According to Einstein's theory we cannot go back in time. Only slow it down or speed it up in relation to others. Meaning you'd stay in the moment but not go back in time.
@@oncetwice6366 Mainly because, from a mathematical perspective, time works both ways therefore time travel is mathematically possible. The kicker is it requires exotic matter that we don't yet know exists. Something with negative mass or negative energy. It's mathematically possible, but we don't yet have physical evidence.
People assume that time is a strict progression of cause to effect, but actually, from a non-linear, non- non-subjective viewpoint, it's more like big ball of wibbly wobbly, timey wimey...stuff.
yesyesyes
+MetaKnight68 Sounds like that sentence got away from you..
Chronos too stronk :D
😍
and listen.. dont turn your back, dont look away and dont blink
I fully understood the solution you gave to the paradox, it is hard to explain to any person in words but I understood it
There's also something, if we're talking about possibilities of abstract concepts, about predestination. That fate destined you to be born to perform the task in order to preserve the flow of time, stating that you were meant to be born, whether into one family or another. Not to suggest that time and space are sentient entities or anything but rather that time flows like a river and moves in the same direction and with the same purpose regardless of the obstacles put in its path. However, predestination is a wholly different topic and really spits in the face of a lot of known sciences so it doesn't really gain any traction... but it would be a simple resolution to a paradox like this.
okay i can understand this video
1:11 Nevermind
+Raspic I marginally understand that superpositions exist and such things but I would really like to know more about the proof of going back in time to be impossible as they presented it.
An example of superposition reasoning is Schrodingers cat, who is also both death and alive at the same time.
+Raspic The loop just loops on forever maybe, I don't understand this because relating it to a superposition makes no sense when we observe the event....
+Hybrid Rainbow We observe the event sure, but the name's quantum superposition and this is definitely not "quantum". This may be something like 'time superpostition', (not a cool name i know, but i just made it up right now so theres that)
Also to the person asking y there's no time travelling to the past i actually dont know for sure but heres some proposed methods, using Wormholes (nearly impossible), using Alcubierre Warp Drives (nearly impossible), i dont know how all of this works, just wikipedia it. But moving forward in time... Now we're getting somewhere, thats really easy but you need a lot of speed, 10% speed of light could provide significant time dilation. Again wikipedia it, or watch Interstellar, that movie is awesome
+Jasvin James You know the wormhole way to travel back in time, a person named 'radekzOL' perfectly explained the way just a few comment threads below.
+Hybrid Rainbow Exactly. People outside the reference frame are going to have some history, either that lineage exists or it doesn't exist. But if we use the superposition idea then everyone else experiences both the lineage existing and not existing at the same time. So if we use super position than we have to go back to the fact that two realities exist, because the super position wouldn't make sense in one solitary realm of existence. I am probably missing something and could be completely wrong, I am no physicists.
anvengers endgame writers: “write that down, write that down!”
Nah, in endgame it was the complete opposite
Endgame's time travel was shit and full of plot holes
@@jayyadav1610 It wasn't shit if u learn Deutsch's Parallel Universe !
@@dafuanisnothere cap gets old.
@@bintangtrawijaya6460 It's kind of complicated, he have broke the science.
One simple answer could be, since you've killed your grandparent, and you cease to exist, the diferential state which caused your branch to exist disappears, and you get a branch where your grandparent is dead instead, replacing yours.
A way to use time travel would be reduce the time to process data. In the present it would take a day days or more, to speed up processing is by sending the computer back in time, instead of processing data in time, can do so in seconds.
Forget the video, He js sponsored by Google HOLY SHIT
is*
+abdullah alshudukhi Yes, he is sponsored by the owners of the very platform he is uploading a sponsored video to.
+Energyxxer
That is Paradox
+Amr ElAdawy No that's politics.
+Hallieisntbritish No, this is Patrick!
Did you really put a subliminal of one direction in your video?
Lol where
0:03
+Malcolm Pagett yes lol
Lol yeah
😨😨😨
If you were to quantum superposition time travel to the past and kill your grandfather, the speed at which you travel would far exceed the flow of time, meaning that while your grandfather's death would take place instantaneously, the events following his death would occur at a normal rate. As a result, the changes resulting from his death would most likely never catch up to you once you return to the present instantaneously
I’m not gonna lie, I actually really like this theory :)
I remember reading a collection of short stories I'd checked out from the local library when I was a kid. I'm pretty sure it was a collection of unfinished tales by C.S. Lewis, but I don't remember the title and a quick google search didn't turn up anything. Anyway, the book included a story about time travel where the main character suggests that you can't send something back in time because the atoms that make that thing up in the present already exist in the past being something else. For example the atoms that make up a chair now were part of a tree in the past, so sending that chair back in time would add a chair's worth of extra mass to the total mass of the universe which is a big no no.
So would the universe break or what
Btw why would anyone want to kill their grandfather anyways?
Hank Hill lol
To suicide without suiciding.
Hank Hill Ha
Redz The Soulless Hater lmao
i have a gun in my holster, and my invention stored away in my pocket. just a quick visit to grandpa with the parents. but the parents, after a little while, go outside for some reason. grandpa looks at me. he smiles. i am slightly uncomfortable. grandpa stands up from the chair and puts his hands on my shoulders. "just let this happen like your daddy did." i am shocked, and silent. grandpa's hands move to my waist. my jeans are unbuttoned and taken off. grandpa takes out his firm cock. my thoughts get over me, and i grab my gun and turn around. seeing grandpa unclothed made me begin to get erect, but i could not let this happen. right before i pull the trigger, grandpa's erect stick of justice touches the invention. i teleport years back to when my grandpa is a child. i appear with my half erect pleasure and pull the trigger, killing little grandpa, last thing he sees being my half-chub.
My brain is melting
Same
+Vegeta
You should borrow Bulma's time machine and test this paradox yourself
Exploding*
Trying to Google my brain, but instead found this:
error 404: Not Found!
grow those brain cells. learn something lolz you're brain isn't melting, it's trying to learn something new.....let it learn....OPEN YOUR MIND QUAID.....wait, what??
Devils hour tv series is excellent depiction of the alternate reality concept.
It's kinda like why we wonder "why is there a universe instead of nothing?"
Is it just me, or do these videos never actually answer the question?
yea they don't tbh, they give an answer that could be one for the question. But you have to realize that there is more than one answer to these types of questions.
He had to be a genius to answer this paradox
they did answer the question, but by making references to particles and waves. If you haven't studied these you wouldn't really get it.
BardicLiving no its just your stupidity
so...before you go back in time and kill your grandfather,everything is normal,your grandfather meets your grandmother,makes a baby(your mother or your father)as a result,you are born so theoretically you are able to go back in time,right?now,you go back in time,kill your young grandfather then your parents never existed thus you never existed but,THE GRANDFATHER STAYS DEATH,because death is death and is not related to any of you and any of your action either you kill him with your bare hands or you use a weapon of some kind.so what is done is done at the point you done it.like perfect murder...who killed him?no one,like really no one
I've always thought of it that way: What you did in the past happened in the past so it must have already affected the future you are currently in. By time-traveling you are causing the future that you came from. So no matter what you do in the past it makes the future that you come from happen in the first place, a future where your grandfather is alive. Therefore, you can try as hard as you like, but you cannot kill your grandfather because something will always happen to prevent it. Otherwise you wouldn't be there to kill your grandfather in the first place. Hope this explanation made sense.
Yeah... There is a even physics theory that it is impossible to do something in the past that affects and changes the future.
Like the movie Alice through looking glass
Harry Potter, Game of thrones, Dark all follows the same time travel theories.
It's called the bootstrap paradox
@Denny of Den Kat Games well, your past self could freak out and try stabbing you with the scissors so... I mean many things can interfere. Or you can even be afraid of changing the past and return to your time. Even in the simplest situations this can be taken into consideration
If it wasn’t for back to the future we wouldn’t know if we actually made an alternate timeline at all
Wait I’m no scientist and this might be really dumb question but since everyone had two grandfather at some point, wouldn’t that be a second variable to the grandfather paradox?
So u mean,
*_YES BUT ACTUALLY NO._*
Yeah that pretty much sums it up.
Yes, but actually no
it is not a paradox , but it is impossible .
@oH well,lord! when wormhole is actived gravity is too strong
Schrodinger: yed
It all depends on what logic of time travel you follow. There are 3 main theories. The first, as mentioned in the video, is that there are alternate timelines in which certain major events in your life happened differently, so going back in time and changing something wouldn’t affect your timeline, but instead it would make a new timeline in which such an event had occurred. An example of this logic being used would be avengers endgame. This means if you go back in time and kill your grandfather, you’ll just be opening up an alternate timeline in which you were never born. However, this timeline would not affect yours at all. The second theory is that it’s a closed loop. This means that while the events do happen in your own timeline, they don’t affect them, since they’re predestined to happen the same way and nothing will change that. This event has occurred many times before and will continue to happen many times over since it’s a loop. An example of this logic being used would be the movie tenet. This would mean that if you went back in time, you might’ve tried to kill your grandfather, but somebody would’ve stopped you, this is because you’re obviously alive up to the point where you’ve went back in time, which means your grandfather hasn’t been killed. This means you’re destined to fail at killing your grandfather, and this event has probably occurred a million times before and will continue to occur a million times more. The final theory is the one most people follow, which is what makes it a paradox. This is the one in which changes to the past will directly have an affect on your timeline. This means that by killing your grandfather you would in fact cease to exist, but in doing so, your grandfather would still be alive. This remains unanswered within the context of this theory.
hey bro. i think i got the answer. just say if you wanna hear it.
@@noahishy4158 I’d love to
@@Lucabistrong I didn't understand anything out of the video but you explained it very well.👍🏻 I think this type of paradox is impossible to exist because, as you mentioned, he has to have lived to the point where he tries to kill his grandfather to be able to attempt this action in the first place. So he could in no way be able to prevent himself from ever being born, which is why he would not be able to kill his grandfather. So in real life, your second theory is the most and actually the only probable way for all these to happen, in my opinion. Do you have any other movie suggestions with regards to this kind of time travel incident/paradox?
"Killing your grandfather you will cease to exist but in doing so your grandfather is still alive" might want to fact check what you wrote here broh. The act of killing someone doesn't cause them to still alive lmao
@@eliftr06 he didn't explain very well at all? He claims 3 main theories, um okay? The third one didn't make any sense and the first one he forgot to mention that you create a new timeline where you aren't born but you are still alive after you kill grandpa so you will keep living in that same timeline and basically replace yourself with yourself.
Here's my explanation of the paradox + a fun brain teaser:
Time travel works in the way you are sending back matter and energy to a different time, so therefore when you travel back in time, there is absolutely no way of preventing yourself from being born; you will be born, because it happens. A more interesting paradox (I haven't thought too much on the solution to this one) is lets say is receiving an book from 10 years in the future, and 10 years later, sending the same book back in time again. After you have just sent this book back in time, where would the book be located? Would there be infinite copies of the book?
I feel like if you could go back in time, you are fated in some way to never kill your grandfather or do anything in the past that would contradict your own existences
So for example, if you were to be visited by future you and be warned about something, you later on in the future will inevitably go back in time to warn your past self.
So if no one has come back in time to warn anyone, then how is time travel (atleast backwards) possible?
The solution is that you become the grandfather
Just like in Futurama
The news is that you are, just like the single electron universe... consciousness splits while being a single one
ZJO_17 what if you were adopted tho
ZJO_17 wouldn’t work cuz you wouldn’t be born to do that
Like Back to the Future gone wrong. You kill your grandfather and marry your grandmother.
Most people think of time as a strictly linear progression of cause and effect, but actually, from a nonlinear, non subjective viewpoint, it's more of a...oh, never mind.
Wibbly wobbly
+Tesla Foil Timey Wimey
+AlphaWolf28 Stuff
+Dlee645 dumbass
+Baked potato 420 It's a quote...
My favorite: if time travel was possible, however distant in the future, it would already be here
But if there still exists a scenario where you kill your grandfather, the paradox will still be present. You've just turned the loop into a helix-it's just the same paradox but from a different perspective.
Barry don't fuck up the timeline
Shahril Mozumder 😂😂
Shahril Mozumder I love this guy but that one liner...😏👏
Thats really ironic with the latest episodes theme of closed time loops.
At the end of the video, did that guy look backwards to see if his future grandson was chasing him with a knife?
+fljpopguy Funny!
+fljpopguy also the predator sound was heard in the background. or a woodpecker, they do sound similar, but it was most probably a predator.
While this video was being recorded, grandchildren out there were planning on traveling back in time to kill their grandfather.
That millisecond 1 Direction edit was GOLD
Better question is were does the matter come from that makes up any object that travels back in time. If any object that exists travels back in time, then the atoms it is made of would sexist in that past time; they were there in the past moment. Time travel it seems would create matter and or energy. A time machine would be a matter duplicator.
"Time only moves in 1 direction"
*shows 1 direction*
0:04
@@dokidoki6094 why is it called a second? Hmmmmm
@@dokidoki6094 Why I asked the quedtion was that for what I was taught by my english teacher, second 2nd is the no 2 position. You mentioned it continues the pattern after 1st ( first) ya. But to gramatically say a second as the first position is like saying the zero 0 is irrelevant in its proper place ie. before 1. Remember, the zero is the thing the moves the nineth 9th to the tenth 10th. The omiting of the zeroth 0th, first position then putting it after the 1 to give you the 10th, shows one the truth of the numb ers. The mental numbness.
@@dokidoki6094 Fair enough. My interplay was more into the symetrics of reasoning based on given linguistics.
I swear lmao
The real answer is that you didn't actually kill your grandpa because you were adopted.
+Behind TheWall Which is the reason you did kill him. No paradox.
+Behind TheWall Then you didnt kill your grandfather, you killed your guardian's father, so, not applicable
It was the neighbor all along.
The adopted murderer. Lol!
That paradox assumes that time is linear and that there's only one timeline
But there's also a theory that every time you make a decision, you create a new timeline where you made a different decision and when you do something by chance you also create a new timeline
For example, you throw a coin to decide something and have created 4 new timelines
One where you didn't throe the coin, one where it lands on heads, one where it lands in tails and ine where it lands on its edge
yet the physics of the coin flip mean that if you have all the information, there is only one possible result. That's one of the reasons I don't give credit to this theory
It took me a few times going over the paradox to actually get it and it's mind boggling 🤯
Him: But that's just avoiding the paradox
Also him: By the way there is no paradox MOVING ON
Exactly 😂
I mean, isn’t the idea of quantum superposition and schrodinger’s cat essentially saying there is a second timeline is created?
There is a possibily, an existence where Schrodinger’s cat is dead and another where it’s alive. Only by opening that box do we find out the reality we’re in.
And similar with the grandfather paradox, by time travelling and offing grandpa then travelling back you go off and create a new possibility, a new existence where your grandpa is dead and kid you doesn’t get born.
Now ofc the time travelling paradox is a bit more complex as it has multitudes more of possibilities.
1. How time travel works, particularly when you go back.
A) When you go back after killing grandpa,
you return to your own timeline where no-one ever killed your grandpa. But the existence of a timeline where your grandpa is dead, and you were never born runs parallel to your original timeline.
B) When you go back after killing your grandpa, you’re forced to live in that new timeline you created. You’re basically a time alien, foreign to thar reality. An existence where you came from where you were born but live in one where you never were born.
C) The fire life reality: By doing the deed, you cease to exist and just disappear but your actions remaining particularly the grandpa killing part. Its kind of like a fire, you burn and destroy and create havoc but once you’re done you disappear and vanish without a trace of your existence except for your handiwork.
@@giovannitorres9337 no (to the superposition is creating a second timeline), it depends on the interpretation
But how does being alive play into this like if I killed my grand father and suddenly ceased to exist but if I'm not alive I can't think so???
War machine had an idea to go to the past and kill baby thanos
CZcams algorithm got us here...
if you kill baby thanos then there wont be any adult thanos and thus no one will snap the gauntlet and thus you won't have the reason to kill baby thanos, then you wont even travel back in time
It just creates a parrallel time line
It just creates alternative reality so they had to take stones and bring them to their reality
Just Another Viewer h
If one ventures into the past and disrupts the chain of events leading to their own birth, it creates a divergence, a splintering of timelines. The act of eliminating the grandfather results not in self-annihilation but rather in the emergence of an alternate reality where the individual still exists. This aligns with a metaphysical interpretation that suggests the unfolding of multiple possibilities coexisting in a complex temporal tapestry.
In order to "go back in time" you'd need to exist outside of time i.e. you'd need to no be cinfined by time. None of us exist outside of time (we're confined by time, space and matter) and therefore can never time travel...
Barry fucking stop now
MEØW hahaha thinking the same thing😂😂
MEØW 😂😂😂
MEØW Screw Zoom
LOL
IN4C10 //3 screw savitar
"Then your father and mother won't have been born" this isn't Alabama bro
?
@@soos4818 when he Kills his Grandfather and then as a cause his mother and father die he suggests that they are Brother and sister and parents.
Alabama shit
Lmmfao.... hahahaha... some here don't get it... oh I get it... but my thought was West Virginia or if you're British. Wales. Lmao
he said or
Damn i didn't think about it
Imagine your grandchild goes back in time and kill's you just to check if the paradox is legit
Me: solves the grandfather prombelm by killing my grandfather
Also me: I forgot to time travel .......
"Time only moves in one direction." *Flashes picture of the band called One Direction*
Underrated
Lmao I was looking for this
*c r i n g e*
I thought I was hallucinating
just goona type this
I feel like your superposition of timelines theory is just a different way of describing the "copy" alternate universe. In both cases, you don't really affect your own history but a different version of it. Whether it eventually loops back to your own history is just extra details.
Ikr!
+John Doe if we have two parts with quuantum states their combinations also have quantum states. We can keep on having combinations of thse to build more complex states. There is no system size scale where quantum mechanics becomes inapplicapbe althught the trackability is easy to loose. One of the main points about schrödingers cat is that if we allow superpositions for atoms we must allow it for cats too, or somehow argue that attaching poison vials to geigercounters is impossible.
Regardless the matrix steady state formulation gives a nice matrix that is hermitian that follows your criteria of being able to give eigenstates.
There is a difference whether such explicit math formulation was given and whether it can be given. But if one looked into it even a little one could find that such a formulation could be given. Saying that someone is wrong because they have not said anything that would warrant to be convinced that what they say is right is a little hasty. It would mean that you are claiming that there is no eludication that could salvage the accuracy of the statements. So you claiming that such an hermitian matrix could not be given is highly bold claim. But because quantum phenomena underlie classical physics we know that grandfather do have wavefunctions. However they are so complex we usually don't bother to figure them out in expicit detasil and use classical (and other) approximations instead. But there is nothing preventing in principle to find out such functions and indeed for quantum to properly explain the classical such functions must exist.
Double slit experiment requires for there to be no way of determining for some electron which slit they came from. There are also explicit path integral formulations where you sum over all consistent pasts. There seems not to be so big difference between multiple timelines and requiring that some events need to be able to have happened multiple ways. It isn't clear to me that the quantum is clear of multiple timelines (althought it doesn't seem to be a natural viewpoint).
+Paul Hill - The problem it has, is ignoring the fact paradoxes can't actually exist...to our mind it may look like it can, but that is just an illusion. For example we all know about Black Holes and the singularity inside each one of them...unfortunately there has been a miss-communication between the lay person and the scientist. Where the scientist knows this term is just '?' and lay person thinks a real singularity is there. Singularities invoke infinite values, and we can't have that, and it would also violate most of Quantum Physics that we know is true.
Let take the Time Traveler to a logical conclusion not thought of: He does kill his grandfather, as further events transpire he discovers not only that his father was adopted, but the murder of Granddad caused the meeting between his parents. (and many other possibilities -- Grandma may have played around...not golf)
It has to be like that, or we have new timelines.
***** when you say "we cannot form a coherent conception of" whether you mean "I and nobody else can't think of a way to handle it" or "no conceptual aparatus could be able to handle it" is kinda critical. If you mean the latter then you have to argue that devices like meta-time are insufficient for the job. If the former its just an argument from lack of imagination/education.
In general ontological time does not need to correspond to experienced time. Its kinda easy to implicitly assume so but things like these thought experiments make the consequences of the assumptions more explicit.
*****- Yes, I think I understand. If it is possible to travel to the past, it is okay as long as that time wave function is not collapsed. Trying to view some paradox will collapse it.
For example I can pass down a note to my descendants to come rescue me from painful events in my life when a time machine is invented...unfortunately that hasn't happened. Anyway, where are all the 'Time Travelers'?
The twist really comes when you go back in time and realise you are alive💀
The bootstrap paradox exampled in doctor who is way cooler. You're a classical music fan, so you travel back in time to meet Beethoven, but when you get there (the height of his popularity) no one has ever heard of him, Beethoven doesnt exist. It just so happens you brought some sheet music for him to sign which you send to get published, you become Beethoven. The question is, if youre copying Beethovens music, but you are Beethoven, who wrote the music?
That one direction band picture in the beginning though...
I paused at the exact moment this showed
Lol
Lol he says direction
@@ozancanca9740 *one direction.
Listen carefully
what
Polt Twist: your grandmother had an affair that's how your father Born.
Knowing this after killing you Grandpa: "WASTED"
Underrated 😂👌
Or what if when you go to kill him you get hit by a car and so you can't kill him anymore? :))))
I dont wanna be that guy but...
Polt
@Justin Y? My god how do you guys even come up with this kind of speech skills
@Justin Y? why are u everywhere
I think Back to the Future 2 handles it best in a most understandable way. When Biff gives himself the sports almanac, it does create an alternate timeline, yet still affects the lives of Doc and Marty when they go back to the present day. The time machine naturally takes them to the present along the skewed alternate timeline. So to the time machine, affecting the past changes the present because the time machine didn't have to choose which timeline's 1985 to bring them to. It naturally brought them to the present that was affected by the change in the past, and likewise, if they traveled to the future like Doc said, it would've been the future of the alternate timeline. Yet it is also an alternate timeline for our characters because they are from the other timeline with the memories and experiences from the other timeline
I love the mobius strip explanation lol, mobius strip has only one surface but we have two different situations going on simultaneously
Me seeing the beginning: hmm ok simple
Looks away for 1 second: ***quantum physics***
Quantum superposition isn’t that bad, it’s what you might learn in school if you choose physics. Google search should clear it up easy
Time Paradox: (exists)
Netflix Dark : Let us introduce ourselves
.ereht olleH :teneT
Sic Mundus Creates Est
@@theouts1der *Sic Mundus Creatus est
Or the movie “Predestination “.
I am actually disappointed in Dark. The overused time loop where the girl's daughter is also her mother is not complicated ;it just doesn't make sense. I think they were trying to come up with complex subplots and ended up creating ones that don't make any sense Imho
I'm leaning towards the theory that Time all happens at once, like ballistic gel and you're the bullet moving through it. Alternate dimensions are just two bubbles bumping into each other for an infinitesimal infinity.
Or we're all just a solid consciousness that broke itself into billions of individuals just out of sheer boredom of being only one thing, and we're all just the same person living every life at the same time..
I believe if it were possible to go back in time then we could be just an observer. We cannot change situations at all.
Just like watching a recorded video you mean. You can just watch the events unfold in front of your eyes all over again.
Plot twist, you were adopted.
But what if your grandfather and father were adopted?
Plot twist: u copied the top comment
Plot twist: you were a mistake
@@josephclegg3562 by different parents
lmao
Science teachers: the test won’t be that hard!
The test:
Underrated comment
@@fishplayztoh not really, the guy explains it better than a teacher. The joke is super bad, the guy literally explained it at the most easiest how to say something confusing
@@SaberSimp69 This!
@@ananttiwari1337 eh sorry I made the wrong reply
@@SaberSimp69 I assume the joke was about the test being to demonstrate why the grandfather's paradox isn't a paradox without using the multiverse theory.
I agree that if you know about superposition and u think about applying this exact knowledge to this problem it's not that hard to create the logical chain showed in the video.
But it for sure shouldn't be easy for most of the students in school, smh.
I like the terminator idea of this paradox.. Basically, it's impossible for you to kill your grandpa.. Whatever you do to the past inevitably cause the future where you came from..
I like that idea, but the simplest thing for us is to admit is that time travel into the past is impossible. But the future might be because of things like time dilation and stuff
@@Broc_Obama Or that "time traveling" has no affect on time traveler. You killed your grandpa - no problem, you come back to the world that doesn't know who you are
Also, something can be a paradox AND at the same time entirely possible. A "paradox" isn't something that isn't possible, but it's something that is just self contradictory. Who said that can't exist?