The Jeans's instability in an expanding medium

The method of two time scales is used to solve the equation describing the evolution of a density perturbation (i.e., Jeans' instability) in any expanding medium. A surprisingly simple result is obtained which offers insight into the role of such cumulative but contradictory effects as gravitat...

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Bibliographic Details
Published in:Astrophysics and space science 1980-12, Vol.73 (2), p.349-353
Main Authors: Baptista, J. P., Gerbal, D.
Format: Article
Language:English
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Summary:The method of two time scales is used to solve the equation describing the evolution of a density perturbation (i.e., Jeans' instability) in any expanding medium. A surprisingly simple result is obtained which offers insight into the role of such cumulative but contradictory effects as gravitational attraction forces and the expanding velocity field. Although the existence of a critical length is confirmed, no catastrophic growth of instability is found.
ISSN:0004-640X
1572-946X
DOI:10.1007/BF00642414