Scientists find upper limit for the speed of sound

Re:Scientists find upper limit for the speed of sound by srl on Sunday October 11, 2020 @12:33AM (#24743742)

Here's the arxiv link, for those who want to read the original article paywall-free: https://arxiv.org/abs/2004.04818.

To be clear, this isn't an unconditional speed limit. It appears to be something like "the maximum speed of sound in matter which consists of atoms" (maybe I've missed a few conditions). In particular, this speed limit is known to be violated inside of neutron stars (where the speed of sound is near 1/sqrt(3) times the speed of light, and may even exceed that).

The paper also mentions a proposed lower bound on viscosity. This is the KSS bound (https://arxiv.org/abs/hep-th/0405231), and various theories violating it have been constructed. The violations, of course, don't get mentioned nearly as much as the proposed (and all-but-debunked) bound.

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Re:Scientists find upper limit for the speed of sound by linspace on Sunday October 11, 2020 @02:02PM (#24747715)

The article is open access under Creative Commons: https://advances.sciencemag.org/content/6/41/eabc8662

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Re:Scientists find upper limit for the speed of sound by srl on Sunday October 11, 2020 @02:40PM (#24747992)

Hah! I didn't even bother to check, I'm so used to just going for the arxiv version when not on campus. (Usually has better formatting too.)

Thanks for pointing that out.

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