Hybrid inflation along waterfall trajectories

Details Hybrid inflation along waterfall trajectories Hybrid inflation along waterfall trajectories

2010-06-23

arxiv.org/abs/1006.4522v3

Phys.Rev.D83:063518,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

10 pages, 5 figures, section III-A on quantum backreactions more detailed, comments on transverse field gradient contribution

Scientific paper

10.1103/PhysRevD.83.063518

We identify a new inflationary regime for which more than 60 e-folds are generated classically during the waterfall phase occuring after the usual hybrid inflation. By performing a bayesian Monte-Carlo-Markov-Chain analysis, this scenario is shown to take place in a large part of the parameter space of the model. When this occurs, the observable perturbation modes leave the Hubble radius during waterfall inflation. The power spectrum of adiabatic perturbations is red, possibly in agreement with CMB constraints. A particular attention has been given to study only the regions for which quantum backreactions do not affect the classical dynamics. Implications concerning the preheating and the absence of topological defects in our universe are discussed.

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