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Isotropization of the universe during inflation

Abstract : A primordial inflationary phase allows one to erase any possible anisotropic expansion thanks to the cosmic no-hair theorem. If there is no global anisotropic stress, then the anisotropic expansion rate tends to decrease. What are the observational consequences of a possible early anisotropic phase? We first review the dynamics of anisotropic universes and report analytic approximations. We then discuss the structure of dynamical equations for perturbations and the statistical properties of observables, as well as the implication of a primordial anisotropy on the quantization of these perturbations during inflation. Finally we review briefly models based on primordial vector field that evade the cosmic no-hair theorem.

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Submitted on : Tuesday, April 19, 2022 - 1:55:32 PM
Last modification on : Wednesday, April 20, 2022 - 3:40:05 AM

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Thiago Pereira, Cyril Pitrou. Isotropization of the universe during inflation. Comptes rendus - Physique, 2015, 16, pp.1027-1037. ⟨10.1016/j.crhy.2015.09.002⟩. ⟨insu-03644678⟩

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