Shear-bulk coupling in nonconformal hydrodynamics
Abstract
We compute the temporal evolution of the pressure anisotropy and bulk pressure of a massive gas using second-order viscous hydrodynamics and anisotropic hydrodynamics. We then compare our results with an exact solution of the Boltzmann equation for a massive gas in the relaxation time approximation. We demonstrate that, within second-order viscous hydrodynamics, the inclusion of the full set of kinetic coefficients, particularly the shear-bulk couplings, is necessary to properly describe the time evolution of the bulk pressure. We also compare the results of second-order hydrodynamics with those obtained using the anisotropic hydrodynamics approach. We find that anisotropic hydrodynamics and second-order viscous hydrodynamics including the shear-bulk couplings are both able to reproduce the exact evolution with comparable accuracy.
Cite
@article{arxiv.1407.4767,
title = {Shear-bulk coupling in nonconformal hydrodynamics},
author = {Gabriel S. Denicol and Wojciech Florkowski and Radoslaw Ryblewski and Michael Strickland},
journal= {arXiv preprint arXiv:1407.4767},
year = {2014}
}
Comments
23 pages, 8 figures; v2 - published version which includes some typo corrections and additional references