Constraining hybrid inflation models with WMAP three-year results

Details Constraining hybrid inflation models with WMAP three-year results Constraining hybrid inflation models with WMAP three-year results

2006-10-03

arxiv.org/abs/astro-ph/0610074v2

Phys.Rev.D75:027302,2007

Astronomy and Astrophysics

Astrophysics

7 pages, 10 figures. V2: References added

Scientific paper

10.1103/PhysRevD.75.027302

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 $n_s\geq1$ 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.

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