Inhomogeneous aspects of cosmology
Inhomogeneous aspects of cosmology
Inhomogeneities are introduced into isotropic cosmologies in the form of gravitational waves. Plane gravitational waves are introduced exactly into the de Sitter universe via a geometrical construction of the Ozsváth–Robinson–Rózga solution of the vacuum field equations with a cosmological constant. Gravitational waves propagating in the isotropic Robertson–Walker universes are described by small perturbations of these universes using gauge-invariant and covariant perturbation theory. These waves are used to construct a model of cosmic background gravitational radiation.
Keywords: inhomogeneities, de Sitter universe, Robertson–Walker universes, perturbations, gravitational waves
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