Radio wave emissions due to gravitational radiation

Details Radio wave emissions due to gravitational radiation Radio wave emissions due to gravitational radiation

1999-07-26

arxiv.org/abs/astro-ph/9907350v2

Astrophys.J. 536 (2000) 875-879

Astronomy and Astrophysics

Astrophysics

11 Pages, Latex, Uses aastex. To appear in Astrophysical Journal

Scientific paper

10.1086/308957

We consider the interaction of a weak gravitational wave with electromagnetic fields in a thin plasma on a Minkowski background spacetime using the 1+3 orthonormal frame formalism. Because gravitational and electromagnetic waves satisfy the same dispersion relation, electromagnetic waves can be effectively generated as a result of this interaction. In the case of the interaction with a static magnetic field, the amplitude of the electromagnetic waves depends on the size of the excitation region in which the magnetic field is contained. It is argued that due to the presence of a plasma this process can also lead to the generation of higher harmonics of the original mode. Estimates are given for this effect in the case of a binary pulsar and a cold electron plasma. It is found that the emmited radiation will lie in the radio frequency band. We also speculate on the possible relevance of this process on situations in cosmology, in particular whether this could be used to constrain primordial magnetic fields.

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