The Jeans Mechanism and Bulk-Viscosity Effects

Details The Jeans Mechanism and Bulk-Viscosity Effects The Jeans Mechanism and Bulk-Viscosity Effects

2009-03-24

arxiv.org/abs/0903.4122v3

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Proceedings of The 3rd Stueckelberg Workshop on Relativistic Field Theories

Scientific paper

In this paper we study the gravitational instability in presence of viscosity. In particular, the standard Jeans Mechanism is analyzed taking into account bulk-viscosity effects in the first-order Newtonian dynamics. We show how the perturbation evolution is damped by dissipative processes and the top-down fragmentation mechanism is suppressed for strong viscous effects. The critical value of the Jeans Mass remains unchanged also in presence of bulk viscosity.

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