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Isotropization of the universe during inflation

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arxiv 1509.09166 v2 pith:EUDVAWU7 submitted 2015-09-30 astro-ph.CO gr-qc

Thiago S. Pereira , Cyril Pitrou This is my paper · ORCID
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keywords anisotropicprimordialcosmicduringexpansioninflationno-hairperturbations
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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 briefly review models based on primordial vector field which evade the cosmic no-hair theorem.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Bianchi cosmologies in a Thurston-based theory of gravity

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    In a Thurston-geometry-dependent gravity theory, non-tilted BKS cosmologies admit shear-free perfect-fluid and static vacuum solutions for all topologies, isotropize under positive Lambda except for some Bianchi II ca...

  2. Intrinsic Torsion, Extrinsic Torsion, and the Hubble Parameter

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    The second fundamental form of a spatial slice in a torsional spacetime is a sum of the Hubble term and an extrinsic torsion term, producing a negative bias in Hubble estimates when torsion is neglected.

  3. Kaluza-Klein inspired a model of the inflation with the inversed power law potential in Bianchi type-I universe

    gr-qc 2025-06 conditional novelty 4.0 of 10

    For a Kaluza-Klein inspired vector-scalar model in Bianchi type-I with inverse power-law potential, center manifold theory shows the isotropic scalar-dominated point E is a stable attractor, supporting isotropization.

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