Analog gravity in nonisentropic fluids
General Relativity and Quantum Cosmology
2019-03-07 v2 High Energy Physics - Theory
Abstract
The analog acoustic metric has been originally derived for adiabatic acoustic perturbations propagating in an isentropic irrotational ideal fluid. In the framework of a Lagrangian hydrodynamic description we demonstrate that under certain conditions the usual acoustic metric can be derived for nonisentropic fluids. In a special case when the pressure takes a special form and the nonadiabatic perturbations are neglected the adiabatic acoustic perturbations corresponding to massless phonons propagate in an analog metric of the usual type.
Keywords
Cite
@article{arxiv.1802.03267,
title = {Analog gravity in nonisentropic fluids},
author = {Neven Bilić and Hrvoje Nikolić},
journal= {arXiv preprint arXiv:1802.03267},
year = {2019}
}
Comments
15 pages, major revision to match the version accepted in CQG, a section on planar black holes added, a few clarifications added, references added, typos corrected