Gravitational instability in presence of bulk viscosity: The jeans mass and the quasi-isotropic solution

N. Carlevaro, G. Montani

Research output: Contribution to conferencePaper

Abstract

This paper focuses on the analysis of the gravitational instability in presence of bulk viscosity both in Newtonian regime and in the fully-relativistic approach. The standard Jeans Mechanism and the Quasi-Isotropic Solution are treated expressing the bulkviscosity coefficient C as a power-law of the fluid energy density ρ, i.e., C = C 0ρs. In the Newtonian regime, the perturbation evolution is founded to be damped by viscosity and the top-down mechanism of structure fragmentation is suppressed. The value of the Jeans Mass remains unchanged also in presence of viscosity. In the relativistic approach, we get a power-law solution existing only in correspondence to a restricted domain of C0. Copyright © 2012 by World Scientific Publishing Co. Pte. Ltd.
Original languageEnglish
Publication statusPublished - 2012
Externally publishedYes
Event12th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, MG 2009 - , France
Duration: 1 Jan 2012 → …

Conference

Conference12th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, MG 2009
CountryFrance
Period1/1/12 → …

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics

Cite this

Carlevaro, N., & Montani, G. (2012). Gravitational instability in presence of bulk viscosity: The jeans mass and the quasi-isotropic solution. Paper presented at 12th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, MG 2009, France.