The Jeans Instability in Presence of Viscous Effects

Abstract

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 both analyzed when bulk viscosity affects the first-order Newtonian dynamics. As results, the perturbation evolution is founded to be damped by dissipative processes and the top-down mechanism of structure fragmentation is suppressed. In such a scheme, the value of the Jeans Mass remains unchanged also in presence of viscosity.

13 pages, 2 figures

References in corpus (1)

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

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• Gravitational instability of the primordial plasma: anisotropic evolution of structure seeds
• Jeans instability for an inert binary mixture: a kinetic theory approach in the Euler regime
• Mathematical analysis of unstable density fluctuations in the dissipative gravitational collapse