Electromagnetic waves around dilatonic stars and naked singularities

Details Electromagnetic waves around dilatonic stars and naked singularities Electromagnetic waves around dilatonic stars and naked singularities

2003-07-07

arxiv.org/abs/gr-qc/0307022v1

Phys.Rev. D70 (2004) 044026

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

9 pages, 1 figure

Scientific paper

10.1103/PhysRevD.70.044026

We study the propagation of classical electromagnetic waves on the simplest four-dimensional spherically symmetric metric with a dilaton background field. Solutions to the relevant equations are obtained perturbatively in a parameter which measures the strength of the dilaton field (hence parameterizes the departure from Schwarzschild geometry). The loss of energy from outgoing modes is estimated as a back-scattering process against the dilaton background, which would affect the luminosity of stars with a dilaton field. The radiation emitted by a freely falling point-like source on such a background is also studied by analytical and numerical methods.

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