Macroscopic approximation to relativistic kinetic theory from a nonlinear closure

JERÓNIMO PERALTA RAMOS; ESTEBAN CALZETTA

PHYSICAL REVIEW D - PARTICLE AND FILDS

APS

Lugar: Ridge; Año: 2013 vol. 87 p. 1 - 6

0556-2821

We use a macroscopic description of a system of relativistic particles based on adding a nonequilibriumtensor to the usual hydrodynamic variables. The nonequilibrium tensor is linked to relativistic kinetictheory through a nonlinear closure suggested by the entropy production principle; the evolution equationis obtained by the method of moments and together with energy-momentum conservation closes thesystem. Transport coefficients are chosen to reproduce second-order fluid dynamics if gradients are small.We compare the resulting formalism to exact solutions of Boltzmann’s equation in 0 þ 1 dimensions andshow that it tracks kinetic theory better than second-order fluid dynamics.