Gravitational vacuum polarization IV: Energy conditions in the Unruh vacuum

Details Gravitational vacuum polarization IV: Energy conditions in the Unruh vacuum Gravitational vacuum polarization IV: Energy conditions in the Unruh vacuum

1997-02-28

arxiv.org/abs/gr-qc/9703001v1

Phys.Rev. D56 (1997) 936-952

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

40 pages; plain LaTeX; uses epsf.sty (ten encapsulated postscript figures); two tables (table and tabular environments). Shoul

Scientific paper

10.1103/PhysRevD.56.936

Building on a series of earlier papers [gr-qc/9604007, gr-qc/9604008, gr-qc/9604009], I investigate the various point-wise and averaged energy conditions in the Unruh vacuum. I consider the quantum stress-energy tensor corresponding to a conformally coupled massless scalar field, work in the test-field limit, restrict attention to the Schwarzschild geometry, and invoke a mixture of analytical and numerical techniques. I construct a semi-analytic model for the stress-energy tensor that globally reproduces all known numerical results to within 0.8%, and satisfies all known analytic features of the stress-energy tensor. I show that in the Unruh vacuum (1) all standard point-wise energy conditions are violated throughout the exterior region--all the way from spatial infinity down to the event horizon, and (2) the averaged null energy condition is violated on all outgoing radial null geodesics. In a pair of appendices I indicate general strategy for constructing semi-analytic models for the stress-energy tensor in the Hartle-Hawking and Boulware states, and show that the Page approximation is in a certain sense the minimal ansatz compatible with general properties of the stress-energy in the Hartle-Hawking state.

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