Bounds on the interior geometry and pressure profile of static fluid spheres

Details Bounds on the interior geometry and pressure profile of static fluid spheres Bounds on the interior geometry and pressure profile of static fluid spheres

2003-06-10

arxiv.org/abs/gr-qc/0306038v1

Class.Quant.Grav. 20 (2003) 3699-3716

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

20 pages. Uses: iopart.cls setstack.sty

Scientific paper

10.1088/0264-9381/20/16/311

It is a famous result of relativistic stellar structure that (under mild technical conditions) a static fluid sphere satisfies the Buchdahl--Bondi bound 2M/R <= 8/9; the surprise here being that the bound is not 2M/R <= 1. In this article we provide further generalizations of this bound by placing a number of constraints on the interior geometry (the metric components), on the local acceleration due to gravity, on various combinations of the internal density and pressure profiles, and on the internal compactness 2m(r)/r of static fluid spheres. We do this by adapting the standard tool of comparing the generic fluid sphere with a Schwarzschild interior geometry of the same mass and radius -- in particular we obtain several results for the pressure profile (not merely the central pressure) that are considerably more subtle than might first be expected.

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