Study of the Quasi-isotropic Solution near the Cosmological Singularity in Presence of Bulk-Viscosity

@article{Carlevaro2007StudyOT,
title={Study of the Quasi-isotropic Solution near the Cosmological Singularity in Presence of Bulk-Viscosity},
author={Nakia Carlevaro and Giovanni Montani},
journal={arXiv: General Relativity and Quantum Cosmology},
year={2007}
}
• Published 13 November 2007
• Physics
• arXiv: General Relativity and Quantum Cosmology
We analyze the dynamical behavior of a quasi-isotropic Universe in the presence of a cosmological fluid endowed with bulk viscosity. We express the viscosity coefficient as a power-law of the fluid energy density: $\zeta=\zeta_0\epsilon^{s}$. Then we fix $s=1/2$ as the only case in which viscosity plays a significant role in the singularity physics but does not dominate the Universe dynamics (as requested by its microscopic perturbative origin). The parameter $\zeta_0$ is left free to define…

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