Magnetized gravitational waves

Details Magnetized gravitational waves Magnetized gravitational waves

2001-01-10

arxiv.org/abs/astro-ph/0101151v3

Phys.Rev. D63 (2001) 123507

Astronomy and Astrophysics

Astrophysics

Minor changes. To appear in Phys. Rev. D

Scientific paper

10.1103/PhysRevD.63.123507

We investigate the influence of cosmic magnetic fields on gravitational wave perturbations, and find exact solutions on large scales. We show that a large-scale magnetic field can generate large-scale non-decaying gravitational waves. In the general case where gravitational waves are generated by other mechanisms, a large-scale magnetic field introduces a new decaying tensor mode and modifies the non-decaying mode. The direct effect of the magnetic field is to damp the gravitational waves, while an indirect magneto-curvature effect can either damp or boost the waves. A magnetic field also leads to a breaking of statistical isotropy, and the magnetic imprint on the tensor spectrum in principle provides a means of detecting a primordial field.

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