Self-gravitating fluid shells and their non-spherical oscillations in Newtonian theory

Details Self-gravitating fluid shells and their non-spherical oscillations in Newtonian theory Self-gravitating fluid shells and their non-spherical oscillations in Newtonian theory

1999-03-05

arxiv.org/abs/gr-qc/9903021v2

Astrophys.J. 521 (1999) 708-717

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages, to be published in the Astrophysical Journal, typos corrected

Scientific paper

10.1086/307560

We summarize the general formalism describing surface flows in three-dimensional space in a form which is suitable for various astrophysical applications. We then apply the formalism to the analysis of non-radial perturbations of self-gravitating spherical fluid shells. Spherically symmetric gravitating shells (or bubbles) have been used in numerous model problems especially in general relativity and cosmology. A radially oscillating shell was recently suggested as a model for a variable cosmic object. Within Newtonian gravity we show that self-gravitating static fluid shells are unstable with respect to linear non-radial perturbations. Only shells (bubbles) with a negative mass (or with a charge the repulsion of which is compensated by a tension) are stable.

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