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Hydrodynamics as sound-speed approaches light-speed

Published 2 Apr 2024 in hep-ph | (2404.01968v2)

Abstract: I present the simplest 3+1 dimensional quantum field theory for which the speed of sound can be arbitrarily close to the speed of light. Examining the hydrodynamics, I find cases where the shear viscosity is finite, but the "shear relaxation coefficient" appears always to be divergently large.

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