Gravitational Waves in Bianchi Type-I Universes I: The Classical Theory

Details Gravitational Waves in Bianchi Type-I Universes I: The Classical Theory Gravitational Waves in Bianchi Type-I Universes I: The Classical Theory

1995-04-27

arxiv.org/abs/gr-qc/9504046v1

Phys.Rev. D52 (1995) 5445-5458

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

34 papers, written in ReVTeX, submitted to Physical Review D

Scientific paper

10.1103/PhysRevD.52.5445

The propagation of classical gravitational waves in Bianchi Type-I universes is studied. We find that gravitational waves in Bianchi Type-I universes are not equivalent to two minimally coupled massless scalar fields as it is for the Robertson-Walker universe. Due to its tensorial nature, the gravitational wave is much more sensitive to the anisotropy of the spacetime than the scalar field is and it gains an effective mass term. Moreover, we find a coupling between the two polarization states of the gravitational wave which is also not present in the Robertson-Walker universe.

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