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Will Kinney Profile picture
@WKCosmo
Oct 19, 2017 • 25 tweets • 3 min read • Read on X
A short thread on why Monday's gravitational wave detection is so devastating to modified-gravity models of Dark Matter like MOND. 1/
For a really nice technical treatment, see this paper. 2/
arxiv.org/abs/1710.06168

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More from @WKCosmo

Will Kinney Profile picture
Apr 23

Image
Having use for this image waaaay too often lately.
en.m.wikipedia.org/wiki/Sterling_…
Read 5 tweets
Will Kinney Profile picture
Feb 24
Bravo to the 22.9% who (correctly) concluded that the string connecting the rocket breaks!

Contrary to what is often taught, it is perfectly possible to handle accelerated reference frames in Special Relativity. This problem is a nice example. 🧵 1/
The rocket problem was first posed by John Bell (same guy as Bell's Theorem in quantum mechanics). The story is, he posed the problem to his colleagues at CERN, and (like the poll) most of them got it wrong!
Physicists are often taught relativity poorly, if at all.
Read 46 tweets
Will Kinney Profile picture
Feb 7
Getting a lot of replies making various claims that this is not a quantum mechanical result, and you can't assign a velocity to electrons in atomic orbitals. Nonsense! This is ALL ABOUT quantum mechanics. Allow me to explain. 1/
Let's consider the simpler system of hydrogen first. The basic properties of the hydrogen atom are a consequence of the Heisenberg uncertainty principle relating the uncertainty of the radius of the electron in orbit to the uncertainty in its momentum, 2/ Image
We can dimensionally estimate the uncertainty in the momentum of the electron by using Coulomb's Law for the potential energy of the electromagnetic interaction between the electron and the nucleus, 3/ Image
Read 16 tweets
Will Kinney Profile picture
Sep 28, 2023
The string breaks.
Lots of responses to the poll, most of them wrong. Image
This is the "spaceship paradox" usually attributed to John Bell (of Bell's theorem in quantum mechanics.) Amusingly, a poll of scientists at CERN had similar results as the twitter poll above. Most of them got it wrong!
en.wikipedia.org/wiki/Bell%27s_…
Read 20 tweets
Will Kinney Profile picture
Jul 24, 2023
OK, saw Oppenheimer. A few reactions, no spoilers. 1/ Image
Extraordinarily well done. Nearly flawless, IMO, and one of the most important and effective pieces of #scicomm I think I have ever seen.
The story really portrays the inner life of physicists, especially theorists, beautifully, and with a deft touch. It does the same with the group dynamics of physicists as they work. It understands us.
Read 11 tweets
Will Kinney Profile picture
Jul 21, 2023
A few words about this paper, which was a lot of fun to write. 1/N https://t.co/PRg3YHPvDr
Image
Most of the heavy lifting on this project was done on a five-week visit to @iitmadras in Chennai in January, working with my awesome collaborators L. Sriramkumar and @suvashis_maity.
This is why we do these research visits! You simply cannot do this kind of thing remotely. You have to be in the place, talking at the blackboard together. There is no substitute.
Read 43 tweets

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