Hybrid Inflation Revisited in Light of WMAP5

Abstract

We study the effects of including one-loop radiative corrections in a non-supersymmetric hybrid inflationary model. These corrections can arise from Yukawa couplings between the inflaton and right-handed neutrinos, and induce a maximum in the potential which admits hilltop-type solutions in addition to the standard hybrid solutions. We obtain a red-tilted spectral index $n_s$, consistent with WMAP5 data, for sub-Planckian values of the field. This is in contrast to the tree level hybrid analysis, in which a red-tilted spectrum is achieved only for trans-Planckian values of the field. Successful reheating is obtained at the end of the inflationary phase via conversion of the inflaton and waterfall fields into right-handed neutrinos, whose subsequent decay can explain the observed baryon asymmetry via leptogenesis.

arXiv comment18 pages (double spaced), including 6 figures and 1 table (v1); 13 pages (single spaced), added 3 references to Ref. [14] and modified placement of table and some figures (v2)

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• Hybrid Inflation
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• A more accurate analytic calculation of the spectrum of cosmological perturbations produced during inflation
• How long before the end of inflation were observable perturbations produced?
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• More hilltop inflation models
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• Testing String Theory with CMB
• Anatomy of F_D-Term Hybrid Inflation
• Chaotic inflation, radiative corrections and precision cosmology
• GUT Inflation and Proton Decay after WMAP5
• Avoiding the blue spectrum and the fine-tuning of initial conditions in hybrid inflation
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• Realistic Hybrid Inflation in 5D Orbifold SO(10) GUT
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Cited by in corpus (21)

• Tensor to Scalar Ratio in Non-Minimal ${\varphi }^4$ Inflation
• Supersymmetric Hybrid Inflation Redux
• Minimal Supersymmetric Hybrid Inflation, Flipped SU(5) and Proton Decay
• Observable Gravity Waves from Supersymmetric Hybrid Inflation II
• Non-Minimal B-L Inflation with Observable Gravity Waves
• Non-Minimally Gravity-Coupled Inflationary Models
• Fractal initial conditions and natural parameter values in hybrid inflation
• SUGRA Hybrid Inflation with Shift Symmetry
• Observable Gravity Waves From Supersymmetric Hybrid Inflation
• Inflation, superheavy metastable strings and gravitational waves in non-supersymmetric flipped SU(5)
• Curvature perturbation spectra from waterfall transition, black hole constraints and non-Gaussianity
• Inflation in Supersymmetric SU(5)
• Higgs Inflation, Quantum Smearing and the Tensor to Scalar Ratio
• Simplified Smooth Inflation with Observable Gravity Waves
• Slow Roll during the Waterfall Regime: The Small Coupling Window for SUSY Hybrid Inflation
• Cosmological Constraints on the Higgs Boson Mass
• Primordial Black Holes and Scalar-induced Gravitational Waves in Radiative Hybrid Inflation
• Modified hybrid inflation, reheating and stabilization of the electroweak vacuum
• Quantum Smearing in Hybrid Inflation with Chaotic Potentials
• New Inflation in Waterfall Region
• Modified hybrid inflation in no-scale SUGRA with suppressed $R$-symmetry breaking