More clickbait than anything. E=MC² can be done as M = E/C²(if disregarding any movement) but more in theory than in practice.While mass is concentrated energy you can't really say light from the sun has mass as the photon itself is massless.
"We show that the commonly accepted statement that sound waves do not transport mass is only true at linear order. Using effective field theory techniques, we confirm the result found by Nicolis and Penco [Phys. Rev. B 97, 134516 (2018)] for zero-temperature superfluids, and extend it to the case of solids and ordinary fluids. We show that, in fact, sound waves do carry mass—in particular, gravitational mass. "
"This implies that a sound wave not only is affected by gravity but also generates a tiny gravitational field, an aspect not appreciated thus far. Our findings are valid for nonrelativistic media as well, and could have intriguing experimental implications."
If audiophiles end up inventing anti-gravity and slap it into cables because someone thinks it'll result in better sound quality, I'll eat my boxers and stream it live.
There is no sound in space. Sound is the vibration of air molecules back and forth, seems fairly obvious that some kind of mass would be involved. Or are they simply applying E=MC² to the air molecules movement in space time? I mean.. you can do that... if you want. I don't know about the actual research but the article is weird.
@TwoEars - Here's the basic gist. Say you have two hermetically sealed rooms with a driver. Before it was thought that there was equal mass between the room that was silent and the room where the driver is blasting music. The analysis however shows that there is an increase in mass in the room with music. If you have a sensitive enough gravitimeter from the outside, you could measure the difference.
It also somewhat changes the maths on phonons, as I understand it, as you can't just apply full virtual particle handwavium baths, and have to consider their mass.
Hmmm...isn't that considering the power source for the driver is external? If the the power is internal so a closed system(room) does the mass still increase? Doesn't that energy just change form but ultimately the amount stays the same disregarding thermal radiation?
@Cspirou Went back to the article and read it 3 more time, this feels like real rabbit hole where you more or less have to spend 2 weeks with the research paper and then sit down with the researchers and ask them what they were doing and thinking. On the surface level it looks like a relatively 'simple' case of E=MC², or maybe even just K.E. = 1/2 m*v2 applied to clouds of molecules. But I take it it's not.
It's not something you ever really need to account for except in a superfluid it or maybe superconducting currents. Something with a macroscopic quantum effect.
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