Density Fluctuations in Thermal Inflation and Non-Gaussianity

Abstract

We consider primordial fluctuations in thermal inflation scenario. Since the thermal inflation drives about 10 $e$-folds after the standard inflation, the time of horizon-exit during inflation corresponding to the present observational scale shifts toward the end of inflation. It generally makes the primordial power spectrum more deviated from a scale-invariant one and hence renders some models inconsistent with observations. We present a mechanism of generating the primordial curvature perturbation at the end of thermal inflation utilizing a fluctuating coupling of a flaton field with the fields in thermal bath. We show that, by adopting the mechanism, some inflation models can be liberated even in the presence of the thermal inflation. We also discuss non-Gaussianity in the mechanism and show that large non-Gaussianity can be generated in this scenario.

15 pages, 1 figures, minor changes

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Cited by in corpus (20)

• Hunting for Primordial Non-Gaussianity in the Cosmic Microwave Background
• On Classification of Models of Large Local-Type Non-Gaussianity
• The hybrid inflation waterfall and the primordial curvature perturbation
• The next non-Gaussianity frontier: what can a measurement with $\sigma (f_{\mathrm{NL}})\lesssim 1$ tell us about multifield inflation?
• Fluctuation-dissipation dynamics of cosmological scalar fields
• The trispectrum in ghost inflation
• Primordial Trispectrum from Isocurvature Fluctuations
• Implications of Planck results for models with local type non-Gaussianity
• Spectator field models in light of spectral index after Planck
• Non-Gaussianity in the inflating curvaton
• Spotted Inflation
• Modulated decay in the multi-component Universe
• Inflection-point Inflation and Dark Matter Redux
• Cosmological moduli problem in large volume scenario and thermal inflation
• Effects of thermal fluctuations on thermal inflation
• New features in curvaton model
• Affleck-Dine baryogenesis with modulated reheating
• Entropy production and curvature perturbation from dissipative curvatons
• Thermal Inflation with a Thermal Waterfall Scalar Field Coupled to a Light Spectator Scalar Field
• QCD Axions and CMB Anisotropy