The Jeans Instability in Presence of Viscous Effects

Details The Jeans Instability in Presence of Viscous Effects The Jeans Instability in Presence of Viscous Effects

2009-07-02

arxiv.org/abs/0907.0434v2

Int. J. Mod. Phys. D 18, 1257 (2009)

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

13 pages, 2 figures

Scientific paper

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.

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