English

Non-Gaussianity from the hybrid potential

High Energy Physics - Theory 2013-05-29 v1 Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology

Abstract

We study the hybrid inflationary potential in a regime where the defect field is light, and more than 60 e-folds of accelerated expansion occur after the symmetry breaking transition. Using analytic and numerical techniques, we then identify parameter values within this regime for which the statistics of the primordial curvature perturbation are significantly non-Gaussian. Focusing on this range of parameters, we provide a specific example which leads to an observationally consistent power spectrum, and a level of non-Gaussianity within current WMAP bounds and in reach of the Planck satellite. An interesting feature of this example is that the initial conditions at horizon crossing appear quite natural.

Keywords

Cite

@article{arxiv.1107.4739,
  title  = {Non-Gaussianity from the hybrid potential},
  author = {David Mulryne and Stefano Orani and Arttu Rajantie},
  journal= {arXiv preprint arXiv:1107.4739},
  year   = {2013}
}

Comments

9 pages, 7 figures

R2 v1 2026-06-21T18:41:05.356Z