On homothetic cosmological dynamics

Details On homothetic cosmological dynamics On homothetic cosmological dynamics

2003-09-25

arxiv.org/abs/gr-qc/0309120v1

Class.Quant.Grav. 20 (2003) 5017-5024

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

8 pages, to be published in Class. Quantum Grav

Scientific paper

10.1088/0264-9381/20/23/005

We consider the homogeneous and isotropic cosmological fluid dynamics which is compatible with a homothetic, timelike motion, equivalent to an equation of state $\rho + 3P = 0$. By splitting the total pressure $P$ into the sum of an equilibrium part $p$ and a non-equilibrium part $\Pi$, we find that on thermodynamical grounds this split is necessarily given by $p = \rho$ and $\Pi = - (4/3)\rho$, corresponding to a dissipative stiff (Zel'dovich) fluid.

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