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

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arxiv gr-qc/9504046 v1 pith:RSV34TX7 submitted 1995-04-27 gr-qc astro-phhep-th

H. T. Cho , A. D. Speliotopoulos This is my paper · ORCID
classification gr-qcastro-phhep-th
keywords gravitationalbianchitype-iuniverseswavesclassicalfindrobertson-walker
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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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  1. Propagation of Gravitational Waves in Anisotropic Universe

    gr-qc 2019-08 reject novelty 3.0 of 10

    In a toy anisotropic universe, gravitational waves acquire direction-dependent dispersion relations and anisotropy-dependent tidal acceleration, but the background equations contain a sign error that undermines the model.

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