Primordial Anisotropies in Gauged Hybrid Inflation

Abstract

We study primordial anisotropies generated in the model of gauged hybrid inflation in which the complex waterfall field is charged under a $U(1)$ gauge field. Primordial anisotropies are generated either actively during inflation or from inhomogeneities modulating the surface of end of inflation during waterfall transition. We present a consistent $\delta N$ mechanism to calculate the anisotropic power spectrum and bispectrum. We show that the primordial anisotropies generated at the surface of end of inflation do not depend on the number of e-folds and therefore do not produce dangerously large anisotropies associated with the IR modes. Furthermore, one can find the parameter space that the anisotropies generated from the surface of end of inflation cancel the anisotropies generated during inflation, therefore relaxing the constrains on model parameters imposed from IR anisotropies. We also show that the gauge field fluctuations induce a red-tilted power spectrum so the averaged power spectrum from the gauge field can change the total power spectrum from blue to red. Therefore, hybrid inflation, once gauged under a $U(1)$ field, can be consistent with the cosmological observations.

21 pages, no figure, minor changes, published version

References in corpus (28)

• Inflationary Universe with Anisotropic Hair
• Generation of Large-Scale Magnetic Fields in Single-Field Inflation
• Magnetic fields from inflation?
• Instability of anisotropic cosmological solutions supported by vector fields
• The Nature of Primordial Fluctuations from Anisotropic Inflation
• Scalar-Scalar, Scalar-Tensor, and Tensor-Tensor Correlators from Anisotropic Inflation
• Anisotropic Power-law Inflation
• Multi-brid inflation and non-Gaussianity
• Instability of the ACW model, and problems with massive vectors during inflation
• Limits on anisotropic inflation from the Planck data
• Large non-Gaussianity from multi-brid inflation
• Nongaussianity from Tachyonic Preheating in Hybrid Inflation
• Hybrid inflation along waterfall trajectories
• Anisotropic Inflation from Charged Scalar Fields
• Anisotropy in solid inflation
• Anisotropic Non-Gaussianity from a Two-Form Field
• Higher order statistics of curvature perturbations in IFF model and its Planck constraints
• Anisotropic power-law k-inflation
• Particle Production of Vector Fields: Scale Invariance is Attractive
• Observational signatures of anisotropic inflationary models
• On the non-Gaussian correlation of the primordial curvature perturbation with vector fields
• Primordial Fluctuations from Inflation with a Triad of Background Gauge Fields
• Waterfall field in hybrid inflation and curvature perturbation
• Gauge field back-reaction in Born Infeld cosmologies
• No Large Scale Curvature Perturbations during Waterfall of Hybrid Inflation
• The different varieties of the Suyama-Yamaguchi consistency relation and its violation as a signal of statistical inhomogeneity
• Analytical Study of Mode Coupling in Hybrid Inflation
• Pseudoscalar N-flation and axial coupling revisited

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• Constant-roll approach to non-canonical inflation
• Primordial Statistical Anisotropies: The Effective Field Theory Approach
• The TT, TB, EB and BB correlations in anisotropic inflation
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• Tsallis holographic dark energy for inflation
• Schwinger Mechanism During Inflation
• Clustering Fossil from Primordial Gravitational Waves in Anisotropic Inflation
• Warm Tachyon Inflation and Swampland Criteria
• Statistical Anisotropies in Gravitational Waves in Solid Inflation
• Beta-function formalism for k-essence constant-roll inflation
• Observational constraints on DBI constant-roll inflation
• Stochastic Effects in Anisotropic Inflation
• Correlating CMB Spectral Distortions with Temperature: what do we learn on Inflation?
• Inflation with multiple vector fields and non-Gaussianities
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• \bf $\delta M$ Formalism: A New Approach to Cosmological Perturbation Theory in Anisotropic Inflation
• Effective field theory of statistical anisotropies for primordial bispectrum and gravitational waves
• Holographic warm inflation
• Hunting for Statistical Anisotropy in Tensor Modes with B-mode Observations
• Inflation with Stochastic Boundary
• Tsallis holographic inflation in $f(R,T)$ gravity: CMB constraints, reheating, and swampland implications
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