Lorentz Violation Explained: Sean Carroll -- Is the Universe Twisted? (084)

#LorentzViolation #SeanCarroll #ChernSimons In 1990, Sean Carroll, George Field, and Roman Jackiw wrote an epochal paper about Lorentz Violation in astronomy that had a tremendous impact on physics and me, in particular.

In this conversation, Sean explains the meaning of Lorentz invariance violation and the background physics behind this effect. We also discuss the implications for physics if the recent claims are confirmed by upcoming polarimeters or other convincing evidence is found.

I will discuss some of the experimental challenges to making such measurement and prospects for upcoming experiments such as CLASS, BICEP Array, SPT3G, Simons Array, ACT, LiteBIRD, Simons Observatory, and CMB Stage 4 to make a definitive, high confidence level claim.

Here is some homework 😂

00:00 INTRO
05:00 THE CONTROVERSY
10:00 WHAT IS LORENTZ VIOLATION
20:00 CALIBRATION OF POLARIZATION
50:00 WHY SEAN IS DUBIOUS?
1:00:00 FINAL THOUGHTS

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Sean Michael Carroll (born October 5, 1966) is a theoretical physicist specializing in quantum mechanics, gravity, and cosmology. He is a research professor in the Walter Burke Institute for Theoretical Physics in the California Institute of Technology Department of Physics.[1] He has been a contributor to the physics blog Cosmic Variance, and has published in scientific journals such as Nature as well as other publications, including The New York Times, Sky & Telescope, and New Scientist.

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Please watch: ""I understand Quantum Mechanics after this discovery!" Stephen Wolfram"
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[debyton]

A really great and refreshing trait of Sean Carroll is, although he certainly could, he never uses words to boost the appearance of his own substantial academic prowess or to obscure any idea he presents no matter how complicated the idea may be. Bravo!

[radical]

I just finished Sean Carrolls 48 part series "Biggest Ideas in the Universe". It was so good, I plan to watch it again.

[dajandroid]

Sean is a great teacher of physics and astrophysics.

[samuellourencojacob]

As a phD student in physics, I find this channel unbelievable... Thank you so much Dr. Brian Keating, and cheers from Europe.

[bytefu]

I've been watching Sean for a few years and what I like about him is... pretty much everything I've seen. Such a great guy overall, and a phenomenal science communicator. People like him and you, Brian, made me love science, which I hated in school, except for chemistry, which was the only subject I loved and aced, until even that flame in me was extinguished, and I've become a mediocre programmer. Thank you, Sean, and all the others for reigniting that flame. Internet is both the best and the worst thing that happened to me ever 😁

[BillyMcBride]

I see that I couldn't get my question answered, but that's alright. I myself see that Sean's concept of poetic naturalism is much more relevant to many matters than a Theory of Everything is, so I hope one day I can have the chance to ask him again. Thanks for a good interview too.

[roberthodgins]

Hey look at that! This is why I couldn’t make any guest recommendations lol you get them all!

[grayaj]

I love that Penrose even acknowledges that his cosmological theory is "far-fetched" and probably not real. But it's worth pursuing, so he does.

[srabanupadhyaya]

came across this paper today and I actually needed this conversation to understand it!

[JAJvdVen]

@Dr Brain I was so looking forward to hearing Sean's answer to the part about criticising theories of everything.. it's seems that Sean does not feel at ease discussing Eric Weinstein's theory. I could only hope that Sean and Eric come together on a podcast so we, as viewers can see an unedited conversation. To edit or not to edit exemplifies a moral stance, but I can understand that wants and needs of guests can lead to 'compromises'.

[silberlinie]

From a naïve point of view, it is much more intuitive
to see the structure of the universe as twisted,
knotted and crumpled, curled and wounded.

Instead of showing a flat, smooth straightforward
homogeneity. If that is what the video title means.

[Jason-gtkx]

Novel Dark Matter Hypothesis
Dark Matter is simply unaccounted for gravity. GR states that gravity is the consequence of the curvature of spacetime. Is it possible that the structure of spacetime itself could be warped without the presence of mass? Spacetime has been shown to react like a fabric by warping, twisting, and propagating independently of mass, and all have been proven with observations from gravitational lensing, frame dragging, and now gravitational waves! Fabrics can be stretched, pressured, and/or heated to the point of causing a deformation. All of these conditions were extreme during inflation, so it is plausible that the “fabric” of spacetime analog could extend having its elastic property have hit a yield point.

Therefore, if gravity is the consequence of the warping of spacetime, and fabrics can be permanently overstretched, then those empty warped geodesics would create gravitational wells independent of mass. My hypothesis of DM is subatomic black hole imprints of the quantum fluctuations that popped in at the moment of inflation. These would be clouds of quantum sized floating fixed geodesics, so they couldn’t expand or evaporate. Perhaps nothing has been detected because there is nothing to detect, and GR wouldn’t require modification of mass interactions because DM would just be an extension of how space-time behaves at extreme conditions. No WIMPS, no MOND, no parallel universes, just empty spacetime deformations that produce gravitational wells to help jump start galaxy accretion processes.

[missshroom]

Secret experiments with Sean Carrol! That would be awesome! Got that from the very beginning

[elontusk]

Why did this pop up three days late?! Good tho, cause now I get to watch it

[williamwhitt]

This discussion is excellent. I look forward to seeing the outcome of Sean's early research. Please keep us posted if that paper becomes public again with more info (preferably with Sean again if possible!)

[DiscoGreen]

Great video. But Sean. It's still hard to consider the multiverse... so just to test it .. I used that Universe splitter after work tonight and it told me I should buy a lotto ticket.. if you're right, I and all those of me that did the same split and wrote this... I'm sure one version of me will win. 😉 gl.

[wulphstein]

I'm still stuck on Sean Carroll's many worlds interpretation as being problematic. It seems to me that if you could have an unlimited number of universes, it wouldn't take long before you found a Holy Ghost Creator who was planning to create a universe anyway.

[GuillermoMartinez-eqkt]

Why was Sean's comments on the theories of everything cut from the tape?

[nolan]

PhD advisors & student talk has me thinking: how do American students pay for it all?

[Jason-gtkx]

Perhaps dark matter isn't a particle, but instead is a cloud of a particle's super position. This cloud of probability might be causing quantum gravity we detect as dark matter...