Mindscape 170 | Priya Natarajan on Galaxies, Black Holes, and Cosmic Anomalies
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- čas přidán 24. 10. 2021
- Patreon: / seanmcarroll
Blog post with audio player, show notes, and transcript: www.preposterousuniverse.com/...
There is so much we don’t know about our universe. But our curiosity about the unknown shouldn’t blind us to the incredible progress we have made in cosmology over the last century. We know the universe is big, expanding, and accelerating. Modern cosmologists are using unprecedentedly precise datasets to uncover more details about the evolution and structure of galaxies and the distribution and nature of dark matter. Priya Natarajan is a cosmologist working at the interface of data, theory, and simulation. We talk about the state of modern cosmology, and how tools like gravitational lensing are providing us with detailed views of what’s happening in the distant universe.
Priya Natarajan received her Ph.D. in astrophysics from the University of Cambridge. She is currently professor of astronomy at Yale University, the Sophie and Tycho Brahe Professor at the Niels Bohr Institute of the University of Copenhagen, and an honorary professor for life at the University of Delhi, India. She is an Affiliate at the Black Hole Initiative at Harvard University and an Associate Member of the Center for Computational Astrophysics at the Flatiron Institute in New York. She is a frequent contributor to the New York Review of Books and other publications. Among her awards are a Guggenheim Fellowship, the India Abroad Foundation’s “Face of the Future” Award, and an India Empire NRI award for Achievement in the Sciences. She is the author of Mapping the Heavens: The Radical Scientific Ideas That Reveal the Cosmos.
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The clarity of sound for the interviewee sounds much better than previous interviews. A joy to listen to with better recording techniques.
What's the 'magik' equipment?
Priya is brilliant. Love her approach. Neptune or Mercury, I won't soon forget that.
Natarajan is a badass sirname for a physicist.. The dancer of creation..
Ooh I love when you cover space topics
Heard her today on CBC. The origin of the concept of black holes originated with John Mitchell, in 1783 who was an English country parson. Thanks for correcting to recognize this fact for future lectures.
Thank you Professors!
Totally love it. Thank you Sean and Priya. Very interesting, intellectual, and fun. Thank you for sharing this with us. 🙏🏻
Thank you for this interview with this intelligent scientist and also my thanks extend to your handling of such interviews. You give the guest his time to explain his issues and you intervene at the right moment to enrich the subject and discussion.
I read her article a couple of years ago on Scientific American about direct collapse supermassive black holes that gave rise to quasars less than a billion years after the big bang. I didn't realize it was her until she talked about it here. Super interesting podcast!!
Is there a Q&A? Priya, could you say something about the virial theorem applied to galaxy clusters and it's agreement with their velocity dispersions...?
Sean and I had a ball. great chat!
Thanks
her GGSL claim was disproved in january 2021 though... so not actually updated
Very interesting, that bit about a 6 billion year gap between proton formation and star formation is either new knowledge or an error. Curious to hear which as science keeps rolling along.
According to what I have read the first stars formed between 200 to 400 million years after the creation of the universe. I doubt if I have the intellect or training to begin to understand how this was determined
Yeah you heard wrong or it was an error if they said there was a 6 billion year gap. They might have been saying we don’t have great instruments to see the universe for a 6 billion year gap
@@timjohnson3913 1:01:00 if you want to hear it for yourself. I meant this woman made an error, not me, just to be clear.
I distilled 5 minutes of discussion into a 10 word generalisation, but aside from some minor details, that is in fact what she said.
What if the path of neutrinos doesn't bend as they speed past massive objects?
Lets say there was some evenly distributed dark matter, some huge amount, say 1 kg/cubic meter. What would this do to light bending? Im guessing nothing because its even. Lets say now some of this dark matter was missing in the center of galaxies. What would that do to the lensing? Im guessing light would then bend away from galaxies. Lets now say this dark matter has negative mass and rename it dark energy. Now what would it do in terms of gravitational lensing?
1:06:47 Sean finishes off his slurpy not realizing his mic was still on.
Could it be that as "matter" is drawn through the event horizon it is stripped of its polarity which is akin to a phase change into dark matter?
💓 PDM
I listened to this in the bath 😁
Haha me too, but I did not wait in the tub while the water drained to watch the vortex. Who does that?
@@timjohnson3913 Oh I do that :D
1:10:27 Super-Double Absolutely followed by a baby absolutely.
Looking forward to my new home, Milkomeda!
👍
Priya Natarajan's GGSL is off by a predicted factor of 10. Could it be the reason is that dark matter has negative curvature? These concave regions may act as lenses to increase the magnification 10 times to the detector.
Actually other teams have cast great doubt over her simulations. Latest to disprove her results was published in january this year (you can find it ob Arxiv as usual). So basically there's no reason to believe her claim,
@@crehenge2386 Well she fully admits that her simulation was off by a predicted factor of 10. However, I think she has the right idea and I was proposing a possible solution.
Just curious. Is there a limit on how many times the verbal tic “sort of” is allowed per hour?
😫
Can someone explain to me why isn't she a Rajan?
Show me one concrete study that shows that dark matter exists, yea you can't.
Brahmins were ruler, copied europian text books, manipulated and published to their name.
Tell us more
Lol
Huh?
Yeah so uh well you what stfu
Hindu Nationalism and their re-writing of history perhaps? Irrelevant, but don't let me spoil the fun.. continue.