What is a Quantum Field?!?
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- čas přidán 18. 06. 2024
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You might hear a lot of physicists talk about how quantum fields govern the microscopic world of elementary particles like electrons, photons, and quarks. How exactly do they do that and what is this quantum field thing anyway?
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VIDEO ANNOTATIONS/CARDS
What the HECK is a Photon?!
• What the HECK is a Pho...
What the HECK are Fields?!?
• What the HECK are Fiel...
What is Quantum Spin?
• What is Quantum Spin?
What Makes Antimatter So Special?!
• What Makes Antimatter ...
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LINKS TO COMMENTS
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If you're looking for more information, check out my more recent video on Quantum Field Theory: czcams.com/video/zS2vI_2faII/video.html
Will definitely take a look!
Best explanation for this stuff I have seen in 62 years. Nicely done.
I second this. I started with the Tao if Physics a few decades ago, and Nick is The Best.
Can u send the 2D or 3D image of quantum field plz?(example:electron field,up-quark field)
You're 62
Well I am 15 and i probably understood what this is
@@atripathi7063 Well since you're trying to flex for no reason this video didn't really give an explanation of what a quantum field is... So ya if you think you understand from this you don't.
At no point did he state how you promote a classical field theory to a quantum one via canonical (anti-)commutation relations. He did not provide a mode expansion of the fields in terms of creation and annihilation operators either. This latter feature makes it clear how the energy spectrum is discrete and not continuous (e.g. quantized) for instance.
This is very watered down to say the least: more like trivia than a explanation. Don't get me wrong, it's good for non experts but it's low hanging fruit most people would be able to "follow". Honestly, only the smart ones would be confused from this video... They ask the simple question "why" opposed to nodding their heads and regurgitating particles are excitations of a underlying quantum field as if that makes any actual sense to them.
@@marcusrosales3344 yessir roast the fuck outta him grandpa
I truly agree with the statement - "Having ideas be separate is great when you are trying to be practical, but deeper understanding comes from seeing how things are the same..." Great man..
It is extremely impressive how you cover entire lectures on electrodynamics, quantum mechanics or optics in only a handful of videos while being beginner friendly and not taking any shortcuts :O Keep going dude!
Yeah, you can tell he really puts a lot of effort into these videos and he has a talent for making complicated things simple.
At 5:39 what are those squares? Are those photons??(grey squares)
@@shashankchandra1068 no no those squares represent the photon field having 0 value, photos are present when one of those squares is at a higher level
He does not cover "entire lectures" in anything. Let's not cheapen what he does so well by misrepresenting it. If he actually showed the mathematics involved, you would quickly lose interest.
37 fields? We must've not discovered the other 5 yet.
Just like this comment lacks 9 more likes.
@@aniksamiurrahman6365 I've finished it
The no. of likes agrees
Now it has 14 duplicate likes.
You should always remember to bring a towel...
Your explanations are always so intuitive and engaging. I absolutely love your videos, Nick. Never stop being awesome!
PSA: Don't be so hard on Henry (MinutePhysics). Him and I just think through things very differently. I was just reminded of the conversation and thought I'd mention it to make a point about how deep this video was going to be. In his defense, my perspective can be a bit pedantic (definition: concerned with details or formalism), but I don't necessarily think that's a bad thing.
The Science Asylum You're actually the opposite of pedantic. Focusing on the details and formalism of a theory isn't the same as being _dogmatic_ about them. The people who are truly pedantic when it comes to science (and there are a lot of them) are nitpicky about formalism because they don't really understand the underlying principles of the theory, and so can't recognize it in any other context outside the basic boundaries of the framework.
Is there a field for gravity?
guppy215 589 That's the gravitational field
I like your explanation the best...makes this fun again. I almost always rewatch EP here.
Hey, you are not pedantic. Your information actually is highly structurized, details you cover are required intermediate steps for deeper understanding of the subject.
Brilliant, this video is detailed enough for me to understand intricacies in a way that no one has yet explained, especially about energy jumps to other fields, but simple enough to not lose my understanding as someone who is not a scientist.
The way in which you explained the link between field and particle; the way in which you unraveled the definition particle... Just made me to think myself as collection of particles, quantized energy creating disturbances across various fields in space-time or much more just to type this comment. Thank you so much!!
It's mind-blowing, isn't it?
Can u send the 2D or 3D image of quantum field plz?(example:electron field,up-quark field)
As a physicist, I can do QFT calculations pretty well. However, I acknowledge it's one of the most batshit insane things ever created. It's quite amazing that it works.
This is the first time I comment on one of your videos. I have watched them all though (some of them several times in different moments) and I keep coming back. The animations and explanations are so original and great, but the best thing about your channel is that you keep truth the main value in your videos and that's outstanding. Many other youtubers say things that are considered "fine" for the general audience but that ends up creating misconceptions. Your pedantry is very unique and you should never change. I have a suggestion:
Could you do a follow-up of this video explaining the difference between an actual excitation of a quantum field (a real particle) and a disturbance (a virtual particle)? From my understanding, a real particle is a nice ripple (excitation) propagating along a quantum field, while a virtual particle is a temporal disturbance that can't exist on its own. The fact that the word "particle" is used for both a real and a virtual one confuses me a lot. I would love a visualization like the one in this video but, instead of an electron-positron anihilation, showing the repulsive interaction of two electrons moving close to one another (and why the interaction of two opposite charged particles is instead attractive).
PD: I bought your book on theoretical physics last year and I absolutely love it!
Well done! This was a really tough topic to cover in your style, but I think you pulled it off nicely. My favourite part was actually where you pointed out that the electric and magnetic wave components don't have a spatial displacement - that has needed saying online for a long time :)
I agree. It drives me nuts that no one ever says that about EM waves.
You have no idea how many videos I've scoured through looking for an explanation for this which satisfies, and is intuitive. When you show your graphic of a wave going through the field you nailed it. Great job!
So well explained, and with amazing visual aids to help get the ideas across. Keep up the good work. :D
By far the best quickie I've seen on QFT for the uninitiated. Extra points for the graphics.
Another awesome video ! The way you explain things is so clear and yet so fun. Thank you so much !
I‘m absolutely in love with quantum mechanics and your channel! Continue beeing yourself!
🐝
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Great video, glad to see it's sponsored..
Would love to hear more about why and how the energy transfers to another field and why are they still separate fields. and what happens to the energy when two photons/excitations in the photon fields annihilate
The is by far the best QFT intro video explanation I’ve seen. Excellent work man
It's crazy the number of times I've come back to rewatch your videos after learning something related to the topic. There are very few channels whose content I regularly rewatch, but your videos are just that good.
This video was a very shallow look at a quantum field theory. The truth is I don't understand QFT as much as I'd like to, so in this video I went as far as I could without running the risk being wrong.
@@ScienceAsylum Fair enough. But for a lay audience it was still quite helpful.
This is the best video I’ve seen don CZcams about quantum physics. You decided to explain something that no one has never have, you should make more videos like this
Nick Lucid is an awesome scientist, deserves more than 1 million subscribers and A VERY HAPPY NEW YEAR TO YOU NICK!!!!!
Happy New Year to you too!
Happy new year!
Mr Nick.
Thanks, this is the best high level explanation I've seen so far. Would love to see you go into more detail in a future video.
This was amazing. Seen so many videos on this and you just explain it so well. Subscribed and time to go back through your CZcams feed! Very good camera work as well and super kid Friendly for my younglings! Keep it up!
"Having ideas to be separate is great if you trying to be practical but deeper understanding comes from seeing how things are the same."
This statement is a summary why I like your channel that much. Deep thoughts, not just textbook-babbling... keep going!
You really are a very clever man. Great stuff, just don't stop.
Best description EVER !!! Thank you so much 🙏
👍This presentation was good. It seemed well thought out for the audience it is aimed at.
I have been wanting to understand more about this topic as I am a laymen on it.
This was probably the most informative you could have been and still kept the conversation basic.
Quantum Field theory sounds so much more natural than particles as little balls idea.
Everytime I rewatch these, I understand a little more. It's like washing a really grimy window - at first things just get all smeary (the information gets tangled and blended) then little by little transparency appears.
My favourite online tutor. chandler i always thought nobody will be able to explain quantum fields with such easiness. Even my teachers were unable to do so. Love your content😚😚
wow.....just amazing stuff out there..so lucky i stumbled upon this..thankyou so much...please continue being youuuuu....
What a valuable 8 minutes! Got an overview of QFT and QED before getting into the complicated math.
This channel IS A HIDDEN GEM!! Nick you deserve to be on the top! Thx so much for the great videos! :D
one of the best and most accessible videos you ever made. thank you - this clarified a lot for me.
This was a great video, really simplified things. Great job bro👌🏽
I bet the scientists who developed QFT had a *field day* with it. :)
Ha!
I love when he calls us crazies. Feels like a brotherhood.
The pedantic details are what makes this channel stand out. I love your work.
A Great explanation of QFT ! U make it so understandable ... I always wonder the time it takes you to make a video like this.
4:49 OMG, didn't see it coming
:-)
Fabulous presentation. Your animations/Graphs are GOLD! Actually, no. They are way more precious than that!
This video sets one going into QED and Quantum Mechanics with a BIG headstart !
Brilliantly done.
Thanks Nick
Nicely done man. I appreciate the whole crazy and clone theme you got going on in your videos. It's definitely unique.
"The physical existence of a field is still up for debate".
God my head hurts.
well we can test that excitations propagate around but we as yet don't have a method to test if a field is fundamentally there. it's kind of like a sheet of graph paper before you graph a curve onto it, there's "nothing there" but there is something there, the graph. a field is roughly a graph with an extra value at each point, and these values move around in the field based on it's rules. ish.
garet claborn do you think all fields are made of energy
The electric field has physical existence in the x-plane surface over an area in free space. Does this explain it well enough? It also describes gyration about the center, forming a portal in the orbital shell, the valence shell for cone duet electric conduction of current forces from atom to atom, and behavior of electric charge 😀.
Can u send the 2D or 3D image of quantum field plz?(example:electron field,up-quark field)
Sally Field: Cute.
Quantum Field: Weird.
Nick Lucid: Awesome scientist.
Happy New Year from Denmark, Nick.
Happy New Year to you too!
Tak skal du have, Nick.
The Science Asylum i8
Such a good combination of visuals and explanation. Thanks
woah happy new year !! U blow my mind !! Calm down...with your extraordinary explanation
Hi, greatings from Algeria. Keep up the good work, your videos are absolutely awesome. I do have aremarque though: it would be great if you could do a video about the quantum entanglement and the EPR paradox ? PLEASE PLEASE PLEASE
THIS CHANNEL DESERVES 100K+ SUBSCRIBERS
Think beyond
Great video. Very well explained! Thank you for your hard work! keep it up!
Dude please keep teaching like this. Thank you!
Oh yeah! More mad science lessons from my favorite mad scientist!
I absolutely LOVE you style, sir! You really know your stuff and explain it SO well!! Thank you!!!
You’re talented at explaining this stuff. I enjoy your channel!
Thanks! Great job explaining this subject.
It was awesome man. Keep It up
I think I'm finally starting to understand why merging gravity has proved so difficult.
Perhaps something that you could discuss in a future episode.
Being an ageing and rather stale crust, I always have difficulty accommodating the adolescent style of these videos, but I still give them top marks for exposition. This video in particular is the clearest lesson on quantum fields I have found on CZcams - a superb piece of teaching. Thank you. My only problem now is avoiding the feeling that I understand it better than I clearly do.
Very helpful! Not many people have been able to pull off such a good explanation for the average person to understand.
awesome! i love your videos, are so well explained and easy to understand, thanks!
one question, how does the fields interact with each other? does the energy transfer from one another or the energy is the connection among every field?
Energy is just a property. Before an interaction, there's a certain amount of it in one field. Afterward, there's that same amount of it in another field. That's all we can really know for sure. We see patterns in behavior and try to make sense of it.
As we don't know how mass and its property energy initially originated, we may imagine fields as origin of mass and its property energy, which initiates them and which is where we can't think beyond, therefore, unresolvable, so nature was renamed as field.
@@ScienceAsylum y does energy exist, is it because of the frequency of the wave function of a particle, higher the frequency, higher the energy of tat particular particle, n even higher momentum?
@@ScienceAsylum particles are when there are excitations in the quantum fields but when the fields are in equilibrium state what creates the energy higher than their vaccum state to make them interact in the first place?
Thanks!!!!! Very well explained!!!
That explanation was a beautiful gift thank you
I love your videos and the way you break things down. Thank you for being you! Keep it up
Thanks!
Great video! You made it easy to understand...
But (and I don't know what it is) it felt like the video fell short, or that it could have gone one to provide more examples of how the various fields interact?
Those kinds of details deserve their own video :-) That's especially true for the quarks.
This channel is growing so fast! Well deserved. Another great video
I don't think so. He doesn't contribute his own conceptions, but elaborates existing ones. Viewers don't grow just by number of videos.
Dude, you're the best!
I love all your videos, especially the Quantum studies!
1:41 haha i remember a friend once told me about why his physics teacher hated teaching General Relativity
I love general relativity.
I'm only in high school, but I couldn't wait until university to learn some GR. So I watched the whole Susskind lectures on GR and absolutely loved them.
I finally at the age of 40 got an inkling of how something can display the properties of both a particle and a wave... thank you!
Would love to see a video on the similarities and differences between special and general relativity and quantum mechanics.
Love the videos and the channel, keep up the great work!
Great explanation! Keep it up 🙌
Can you clarify what you mean by energy moving through fields? I thought energy couldn't exist by itself? Isn't it just a property of matter? How can particles be different energy levels of a field if the energy is a property of the particles? Sorry for so many questions.
You are correct that energy can't exist by itself. It's a property that things have. This is what makes quantum field theory so hard. If energy is just a property, quantum fields are collections of properties, and particles are just parts of fields; then what are we left with? Nothing? That's one interpretation, but there are two better ways to look at this:
1) This is just a model like any other model. What's real and what's not, what's physical and what's not doesn't matter. What matter is what we can do with it.
2) The thing that exists is just "the universe." It's one thing. Everything else (energy, particles, etc) are all just properties in parts of that universe.
I like the second option better.
@@ScienceAsylum Both options sound like "shut up and calculate" to me!
@@ScienceAsylum I also like the second option, which seems to dovetail nicely with some pretty deep spiritual ideas about reality and the universe. The first option is just hand-waving, in my opinion.
Can u send the 2D or 3D image of quantum field plz?(example:electron field,up-quark field)
Okay, this is crazy, but when I was in elementary school, I wondered if everything didn't actually move, but just looked like it, like pixels on a screen, where pieces light up and others don't to make *things*. Then after a while I decided that was ridiculous because nothing acts like that. But if I understand this correctly... I was kind of right?
Kind of, yeah...
The Science Asylum okay, so does quantum field theory enforce the conservation of energy? Like the sum of energy in all fields is always the same?
Conservation of energy is a _very_ big deal in QFT, yes. If one field gains energy, another one must have lost it.
The Science Asylum Coolio! How does Dark Energy link into QFT? Since the expansion has a great deal to do with vacuum, or "ground state".
Does this subject require another video to cover?
LDS_ Link
I had the same idea.I always imagined movement as 3D pixels lighting up,or something to that effect
It's astonishing how you can present the concepts so precisely with this simple presentation style. A lot of detail that is omitted in other popular science literature/videos and buried in technicallity in textbooks just comes out almost naturally on your channel.
Maybe you could also try to explain why we have these three different kinds of interactions in the standard model with a follow up video with the topic on either the standard model itself or how most of modern physics is derived from symmetries. After all each interaction is simply the consequence of another gauge symmetry so the explanation of the concept only depends on how well you can introduce gauge invariance for the electromagnetic field. I think this is one of the topics thats really missing regarding popular science, while it is actually really easy to understand if explained right.
I definitely want to come back to this. There's a lot more to talk about.
Nick -- a wonderful explanation !! You are the best !!
Fantastic!!! I have been looking for this video since 1926!!
25 past 7?? :)
Not quite, try again.
tonyh0905 😂🤣
Great video :)
Excellent explanation.Thanks!
Thanks for posting this great video, much appreciated : )
Hey Nick! Since all of particles are fields, and space is a field, does space have a particle to itself?
Hypothetically, that would be the graviton, but we've never been able to observe anything like a graviton.
happy New year Nick ..best wishes from India. .could you please do video on TENSORS..?still not able to understand what it is
Thanks for this video. I love your videos, very informative. I'd like more of videos from you on this type of subject :)
I am happy for you now getting sponsers😊 keep up the good work
I like your videos because they are pedantic. I feel like too many science sources in popculture dumb things down to the point where their explanations of topics isn't accurate.
I love how all science fields have correlation through M A T H S ❤️
Me too, Jabril! BTW, I'm really digging your neural network videos. Good stuff!
Calculation can be applied to anything as needed. Calculation doesn't correlate anything. For instance, articles of daily use say your toothbrush + shoe = 2 articles, doesn't correlate shoe and toothbrush by virtue of calculation and same is true for anything else.
Now, THAT is pedantic!
Calculations or numerical exist due to the existence of MassEnergy units or systems in the universe. Maths is not a philosophy. Maths would be non-existent without MassEnery systems in our daily life. It is pertinent upon all physical existences and other fields (of study). Things are physically co-related in the universe (relativity).
@@ScienceAsylum You're wrong, there is no correlation between the sciences through math. This is akin to saying there is correlation between the sciences through English.... This is nonsense.....
Awesome explanation! Thank you mate!
That explanation was the best (for me), I’ve ever seen! Well done!
Glad it helped! 🤓
If both waves and particles are energies in fields, then what's the difference between a wave and a particle?
Or is it perhaps that we have models which produce different, equally valid results for the same object.
There isn't one. Every elementary particle has wave properties.
Ok, thanks!
Can u send the 2D or 3D image of quantum field plz?(example:electron field,up-quark field)
Excellent video, bit I think Higgs Boson has a spin of 0.
Son of a... thanks for noticing the typo. It will be fixed in future videos.
@@ScienceAsylum
Loll
Thanks Nick awesome as always!
Really great explained man !!!! my teacher just buzzed up everything and you had just make it clear thanks
You're very welcome! 🤓
I LOVE THE SCIENCE ASYLUM!!!!!!!!!!
wow wow wow wow
Yes!! I kow right!
I like that you've slowed down your delivery without removing your energy (sorry bout the pun) for conveying it. Much easier to follow
I've realized slowing down doesn't mean I have to embrace sanity.
I could learn a lot from this! Thanks!
Can you do an extensive version with mathematical equations, derivations and proof?
With equations it takes many many hours to explain. Good playlists if you're interested:
theoreticalminimum.com/courses/supplemental
czcams.com/play/PLDlWMHnDwyljKJt-nGIw8rJZxSy2DGvNZ.html
thedeemon yeah i know but its more fun
thedeemon thanks for the link tho
IMO being pedantic is what sets you apart from other edutaining videos
Thanks!
I second that.
Right, but going beyond physical sciences may leave you psychic, for instance, Field Theory, Infinity.
This video has didactic depth that stands on a par with Feynman's lectures IMO. Can't say how grateful I am. Keep on sciencing!