Anisotropic Inflation from Vector Impurity

Abstract

We study an inflationary scenario with a vector impurity. We show that the universe undergoes anisotropic inflationary expansion due to a preferred direction determined by the vector. Using the slow-roll approximation, we find a formula to determine anisotropy of the inflationary universe. We discuss possible observable predictions of this scenario. In particular, it is stressed that primordial gravitational waves can be induced from curvature perturbations. Hence, even in low scale inflation, a sizable amount of primordial gravitational waves may be produced during inflation.

16 pages, 4 figures, improved section V, to be published in JCAP

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Cited by in corpus (92)

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• Scalar-Scalar, Scalar-Tensor, and Tensor-Tensor Correlators from Anisotropic Inflation
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• Ghost instabilities of cosmological models with vector fields nonminimally coupled to the curvature
• Anisotropic Power-law Inflation
• Instability of the ACW model, and problems with massive vectors during inflation
• Bayesian analysis of sparse anisotropic universe models and application to the 5-yr WMAP data
• Statistical anisotropy of the curvature perturbation from vector field perturbations
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• Non-Gaussianity and statistical anisotropy from vector field populated inflationary models
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• Anisotropic Inflation with Non-Abelian Gauge Kinetic Function
• Non-gaussianity from the trispectrum and vector field perturbations
• Anisotropic dark energy and CMB anomalies
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• Light Dark Photon Dark Matter from Inflation
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• Dynamical Analysis of Anisotropic Inflation
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• Einstein-Proca theory from the Einstein-Cartan formulation
• Inflaton Two-Point Correlation in the Presence of a Cosmic String
• Narrowing the window of inflationary magnetogenesis
• Bianchi cosmologies with $p$-form gauge fields
• Anisotropic Massive Gauge-flation
• An Hamilton-Jacobi formulation of anisotropic inflation
• Dark Energy Cosmology with the Alternative Cosmic Microwave Background Data
• Anisotropic Scalar Field Dark Energy with a Disformally Coupled Yang-Mills Field
• Noether Symmetry Approach in "Cosmic Triad" Vector Field Scenario
• Timelike Vector Field Dynamics in the Early Universe
• Extended FLRW Models: dynamical cancellation of cosmological anisotropies
• Knot Universes in Bianchi Type I Cosmology
• Modulation of the waterfall by a gauge field
• Cosmic No-hair Conjecture and Inflation with an SU(3) Gauge Field
• Generalized disformal invariance of cosmological perturbations with second-order field derivatives
• Imprints of a hemispherical power asymmetry in the seven-year WMAP data due to non-commutativity of space-time
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• The Primordial Magnetic Field (PMF) Generated in Large Field Inflation (LFI), Natural Inflation (NI) and $R^2$-Inflation by $f^{2}FF$ Model