Fermionic Isocurvature Perturbations
arXiv:1306.1966 · doi:10.1103/PhysRevD.91.043516
Abstract
Isocurvature perturbations in the inflationary literature typically involve quantum fluctuations of bosonic field degrees of freedom. In this work, we consider isocurvature perturbations from fermionic quantum fluctuations during inflation. When a stable massive fermion is coupled to a non-conformal sector different from the scalar metric perturbations, observably large amplitude scale invariant isocurvature perturbations can be generated. In addition to the computation of the isocurvature two-point function, an estimate of the local non-Gaussianities is also given and found to be promising for observations in a corner of the parameter space. The results provide a new class of cosmological probes for theories with stable massive fermions. On the technical side, we explicitly renormalize the composite operator in curved spacetime and show that gravitational Ward identities play an important role in suppressing certain contributions to the fermionic isocurvature perturbations.
51 pages, 4 figures
References in corpus (38)
- Planck 2013 results. XXII. Constraints on inflation
- Measuring the Baryon Acoustic Oscillation scale using the SDSS and 2dFGRS
- Primordial Non-Gaussianities from Inflation Models
- Planck 2013 Results. XXIV. Constraints on primordial non-Gaussianity
- Axions : Theory and Cosmological Role
- Constraints on the Reheating Temperature in Gravitino Dark Matter Scenarios
- Dark Matter Candidates: A Ten-Point Test
- Curvature and isocurvature perturbations in two-field inflation
- Inflaton Decay in Supergravity
- The Gravitino-Overproduction Problem in Inflationary Universe
- Isocurvature bounds on axions revisited
- Constraining Isocurvature Initial Conditions with WMAP 3-year data
- Non-Gaussianities from ekpyrotic collapse with multiple fields
- Anomaly-Induced Inflaton Decay and Gravitino-Overproduction Problem
- Multifield DBI Inflation and Non-Gaussianities
- Non-gaussianity and cosmic uncertainty in curvaton-type models
- Fermion Mass Generation in de Sitter Space
- Correlated isocurvature perturbations from mixed inflaton-curvaton decay
- Primordial non-Gaussianity from two curvaton decays
- Isocurvature, non-gaussianity and the curvaton model
- Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
- Primordial perturbations and non-Gaussianities from modulated trapping
- Dilaton Dynamics from Production of Tensionless Membranes
- A non-Gaussian landscape
- Anomalous Dimensions and Non-Gaussianity
- Non-Gaussianity from Baryon Asymmetry
- Ultraviolet Divergences in Cosmological Correlations
- General treatment of isocurvature perturbations and non-Gaussianities
- Primordial Non-Gaussianity in Models with Dark Matter Isocurvature Fluctuations
- Probing a QCD String Axion with Precision Cosmological Measurements
- Density Perturbations from Modulated Decay of the Curvaton
- Non-Gaussianities from the Standard Model Higgs
- Primordial Trispectrum from Isocurvature Fluctuations
- Non-Gaussianity from Attractor Curvaton
- Quadra-Spectrum and Quint-Spectrum from Inflation and Curvaton Models
- Extended analysis of CMB constraints on non-Gaussianity in isocurvature perturbations
- Quadratic Isocurvature Cross-Correlation, Ward Identity, and Dark Matter
- Dynamical Higgs potentials with a landscape
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- On the origin of entropy of gravitationally produced dark matter: the entanglement entropy
- Fermions in Hybrid Loop Quantum Cosmology
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- Ultra High Energy Cosmic Rays & Super-heavy Dark Matter
- Large Blue Spectral Isocurvature Spectral Index Signals Time-Dependent Mass
- Gravitationally produced Top Quarks and the Stability of the Electroweak Vacuum During Inflation
- Manifestly Unitary Cosmological Perturbation Theory