Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-08-17
Phys. Rev. D 85, 024008 (2012)
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
16 pages, 3 figures, minor corrections to content, references added, matches PRD accepted version
Scientific paper
10.1103/PhysRevD.85.024008
We consider a gravitating spherically symmetric nonrelativistic configuration consisting of a massless chameleon scalar field nonminimally coupled to a perfect isothermal fluid. The object of this paper is to show the influence of the chameleon scalar field on the structure and evolution of an isothermal sphere. For this system we find static, singular and regular solutions depending on the form of the coupling function. A preliminary stability analysis indicates that both stable and unstable solutions exist. For unstable configurations, by choosing the special form of the coupling function, we consider the problem of the gravitational collapse by applying the similarity method.
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