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.
Einstein, Sitzungsber
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Propagation of Gravitational Waves in Anisotropic Universe
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.