Bounds on the energy densities of ground states on static spacetimes of compact objects

Details Bounds on the energy densities of ground states on static spacetimes of compact objects Bounds on the energy densities of ground states on static spacetimes of compact objects

2005-07-20

arxiv.org/abs/gr-qc/0507089v1

Phys.Rev. D73 (2006) 124009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

25 pages, 2 figures

Scientific paper

10.1103/PhysRevD.73.124009

In this paper we investigate quantum fields propagating on given, static, spherically symmetric spacetimes, which are isometric to a part of the Schwarzschild spacetime. Without specifying the internal geometry we show, that there exist bounds on the energy densities of ground states of a quantum scalar field on such spacetimes. The bounds (from above and below) come from the so-called Quantum Energy Inequalities, and are centered around the energy density of the Boulware state (the ground state for Schwarzschild spacetime). The specific value of the bound from below depends critically on the distance $\ell$ from the horizon, where the spacetimes of compact objects cease to be isometric to the Schwarzschild spacetime. In the limit of small $\ell$ we prove, that the energy densities of ground states cannot be below the Boulware level.

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