Tuesday, March 26, 2019

Mark Buchanan. Focus: Sound Waves Carry NEGATIVE Mass. Physics 12/23. 1 Mar 2019

https://www.dailykos.com/stories/2019/3/23/1844497/-Daily-Kos-Science-theory-suggests-that-sound-waves-generate-negative-gravity??detail=emaildkre

So new coverage of the previous research I had blogged on.

Esposito suggests [others] may have overlooked the effect because they rarely think about interactions with gravity. But he and his colleagues are high-energy physicists. “I think it helped us to have a different mindset.”...
The team says that their analysis revealed the effect because it goes beyond the simplified linear models....
The mass carried by sound waves turns out to be negative. It is a depletion of mass, rather an addition of mass.
For ordinary sound waves in most materials, the mass carried is equal to the sound wave energy multiplied by a factor that depends on the speed of sound and the medium’s mass density.
Yet  this new phenomenon still relies on classical physics:

The theory assumes Newtonian conditions, so the effect is unrelated to either quantum theory or the equivalence of energy and mass known from [special] relativity.

Physics 12, 23
Even if you ignore general relativity, sound waves transport a small amount of mass, according to theory.

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