Spherical scalar waves and gravity - red shift and backscattering

Details Spherical scalar waves and gravity - red shift and backscattering Spherical scalar waves and gravity - red shift and backscattering

1997-12-03

arxiv.org/abs/gr-qc/9712022v1

Class.Quant.Grav.15:1653-1668,1998

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Revtex, 16 pages, 3 figures

Scientific paper

10.1088/0264-9381/15/6/019

This article investigates the interaction of a spherically symmetric massless scalar field with a strong gravitational field. It focuses on the propagation of waves in regions outside any horizons. The two factors acting on the waves can be identified as a redshift and a backscattering. The influence of backscattering on the intensity of the outgoing radiation is studied and rigorous quantitative upper bounds obtained. These show that the total flux may be decreased if the sources are placed in a region adjoining an apparent horizon. Backscattering can be neglected in the case $2m_0 /R<< 1$, that is when the emitter is located at a distance from a black hole much larger than the Schwarzschild radius. This backscattering may have noticeable astrophysical consequences.

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