Constraining hybrid inflation models with WMAP three-year results

Abstract

We reconsider the original model of quadratic hybrid inflation in light of the WMAP three-year results and study the possibility of obtaining a spectral index of primordial density perturbations, $n_s$, smaller than one from this model. The original hybrid inflation model naturally predicts $n_s\ge 1$ in the false vacuum dominated regime but it is also possible to have $n_s<1$ when the quadratic term dominates. We therefore investigate whether there is also an intermediate regime compatible with the latest constraints, where the scalar field value during the last 50 e-folds of inflation is less than the Planck scale.

7 pages, 10 figures. V2: References added

References in corpus (7)

• Particle Physics Models of Inflation and the Cosmological Density Perturbation
• Hybrid Inflation
• False Vacuum Inflation with Einstein Gravity
• Inflation Dynamics and Reheating
• Inflation after WMAP3: Confronting the Slow-Roll and Exact Power Spectra with CMB Data
• Inflation model constraints from the Wilkinson Microwave Anisotropy Probe three-year data
• Recovering the Inflationary Potential and Primordial Power Spectrum With a Slow Roll Prior: Methodology and Application to WMAP 3 Year Data

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• Bubbling the False Vacuum Away
• Cosmic microwave background and large-scale structure constraints on a simple quintessential inflation model
• CMB and LSS constraints on a single-field model of inflation
• Supersymmetry and Fermionic Modes in an Oscillon Background