In a Hooke's law solid, a sound wave packet produces a net backward displacement of matter, equivalent to a mass deficit M = -(9/8) E/c_L^2 per unit area.
Comment on "Gravitational Mass Carried by Sound Waves"
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We comment on the paper A. Esposito, R. Krichevsky, and A. Nicolis, "Gravitational Mass Carried by Sound Waves", Phys. Rev. Lett. 122, 084501 (2019). Our comment aims to avoid the confusion arisen in the scientific community and beyond on how the result of Esposito et al. should be interpreted.
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Sound waves move matter
In a Hooke's law solid, a sound wave packet produces a net backward displacement of matter, equivalent to a mass deficit M = -(9/8) E/c_L^2 per unit area.