Observational constraints on models of inflation from the density perturbation and gravitino production

Details Observational constraints on models of inflation from the density perturbation and gravitino production Observational constraints on models of inflation from the density perturbation and gravitino production

2000-12-06

arxiv.org/abs/hep-ph/0012065v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Updated version of a talk at COSMO2K, to appear in the proceedings

Scientific paper

Present data require a spectral index $n\gsim 0.95$ at something like 1-$\sigma$ level. If this lower bound survives it will constrain `new' and `modular' inflation models, while raising it to 1.00 would rule out all of these models plus many others. After inflation, gravitinos are created by the oscillating field until the `intermediate' epoch when the Hubble parameter falls below the gravitino mass, or reheating, whichever is earlier. In a wide range of parameter space, these gravitinos are more abundant than those from thermal collisions, leading to stronger cosmological constraints.

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