On the equivalence of nonadiabatic fluids

Details On the equivalence of nonadiabatic fluids On the equivalence of nonadiabatic fluids

2010-11-17

arxiv.org/abs/1011.4097v1

Phys.Rev.D82:124020,2010

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 14 figures. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.82.124020

Here we show how an anisotropic fluid in the diffusion limit can be equivalent to an isotropic fluid in the streaming out limit, in spherical symmetry. For a particular equation of state this equivalence is total, from one fluid we can obtain the other and vice versa. A numerical master model is presented, based on a generic equation of state, in which only quantitative differences are displayed between both nonadiabatic fluids. From a deeper view, other difference between fluids is shown as an asymmetry that can be overcome if we consider the appropriate initial-boundary conditions. Equivalence in this context can be considered as a first order method of approximation to study dissipative fluids.

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