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}
}
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… 
The Jeans Instability in Presence of Viscous Effects
An analysis of the gravitational instability in presence of dissipative effects is addressed. In particular, the standard Jeans Mechanism and the generalization in treating the Universe expansion are
EARLY COSMOLOGY AND FUNDAMENTAL GENERAL RELATIVITY
  • Physics
  • 2007

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