Resonant interaction between gravitational waves, electromagnetic waves and plasma flows

Details Resonant interaction between gravitational waves, electromagnetic waves and plasma flows Resonant interaction between gravitational waves, electromagnetic waves and plasma flows

2003-02-11

arxiv.org/abs/gr-qc/0302039v2

Phys.Rev. D68 (2003) 044017

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

12 pages, 1 figure, typos corrected and numerical example added

Scientific paper

10.1103/PhysRevD.68.044017

In magnetized plasmas gravitational and electromagnetic waves may interact coherently and exchange energy between themselves and with plasma flows. We derive the wave interaction equations for these processes in the case of waves propagating perpendicular or parallel to the plasma background magnetic field. In the latter case, the electromagnetic waves are taken to be circularly polarized waves of arbitrary amplitude. We allow for a background drift flow of the plasma components which increases the number of possible evolution scenarios. The interaction equations are solved analytically and the characteristic time scales for conversion between gravitational and electromagnetic waves are found. In particular, it is shown that in the presence of a drift flow there are explosive instabilities resulting in the generation of gravitational and electromagnetic waves. Conversely, we show that energetic waves can interact to accelerate particles and thereby \emph{produce} a drift flow. The relevance of these results for astrophysical and cosmological plasmas is discussed.

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