Curvature Perturbations from a Massive Vector Curvaton

Abstract

We study a ghost-free model of massive vector curvaton proposed in the literature, where the quick decrease of the vector background expectation value is avoided by a suitable choice of kinetic and mass functions. The curvaton perturbations of this model have been so far computed assuming that these functions are external classical quantities, and it was found that some special time evolution of these functions leads to scale invariant and statistically isotropic perturbations of the vector curvaton. However, external functions should be understood as originating from the expectation value of some additional field. Since these functions need to present a non-trivial evolution during inflation, the field cannot be trivially integrated out, and, in particular, its perturbations need to be included in the computation. We do so in a minimal implementation of the mechanism, where the additional field is identified with the inflaton. We show that, except for a narrow window of model parameters, the interaction with this field generally causes the curvature perturbations to violate statistical isotropy beyond the observational limit.

23 pages, 5 figures, references added and sorted, a footnote added

References in corpus (26)

• Observational Signatures and Non-Gaussianities of General Single Field Inflation
• Inflationary Universe with Anisotropic Hair
• Vector Inflation
• Large Nongaussianity in Axion Inflation
• Generation and Characterization of Large Non-Gaussianities in Single Field Inflation
• Magnetic fields from inflation?
• Enhanced Non-Gaussianity from Excited Initial States
• Instability of anisotropic cosmological solutions supported by vector fields
• The Nature of Primordial Fluctuations from Anisotropic Inflation
• Cosmic Microwave Background Statistics for a Direction-Dependent Primordial Power Spectrum
• Gravity waves and non-Gaussian features from particle production in a sector gravitationally coupled to the inflaton
• Scalar-Scalar, Scalar-Tensor, and Tensor-Tensor Correlators from Anisotropic Inflation
• Inflationary perturbations in anisotropic backgrounds and their imprint on the CMB
• Can a vector field be responsible for the curvature perturbation in the Universe?
• Instability of the ACW model, and problems with massive vectors during inflation
• Anisotropic Inflation from Vector Impurity
• Large Nongaussianity from Nonlocal Inflation
• Anisotropic non-Gaussianity from vector field perturbations
• On Features and Nongaussianity from Inflationary Particle Production
• Non-gaussianity of inflationary field perturbations from the field equation
• Particle Production of Vector Fields: Scale Invariance is Attractive
• Non-minimally coupled vector curvaton
• Predictions for Nongaussianity from Nonlocal Inflation
• Primordial perturbations and non-Gaussianities from modulated trapping
• Nongaussianity from Particle Production During Inflation
• Supergravity inspired Vector Curvaton

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• Anisotropy in solid inflation
• Vector Coherent Oscillation Dark Matter
• Stable solutions of inflation driven by vector fields
• On the stability and causality of scalar-vector theories
• Stability analysis of inflation with an SU(2) gauge field
• The charged inflaton and its gauge fields: preheating and initial conditions for reheating
• Light propagation in inhomogeneous and anisotropic cosmologies
• Inflationary Dynamics with a Non-Abelian Gauge Field
• Anisotropic $2$-form dark energy
• Disformal vectors and anisotropies on a warped brane
• Anisotropic inflation with coupled $\mathbf{p}$-forms
• Primordial power spectrum of tensor perturbations in Finsler spacetime
• Modulation of the waterfall by a gauge field
• Scale and shape dependent non-Gaussianity in the presence of inflationary vector fields
• Inflationary buildup of a vector field condensate and its cosmological consequences
• Hidden in the background: a local approach to CMB anomalies
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