Universality in Multifield Inflation from String Theory
Abstract
We develop a numerical statistical method to study linear cosmological fluctuations in inflationary scenarios with multiple fields, and apply it to an ensemble of six-field inflection point models in string theory. The latter are concrete microphysical realizations of quasi-single-field inflation, in which scalar masses are of order the Hubble parameter and an adiabatic limit is reached before the end of inflation. We find that slow-roll violations, bending trajectories and 'many-field' effects are commonplace in realizations yielding more than 60 e-folds of inflation, although models in which these effects are substantial are in tension with observational constraints on the tilt of the scalar power spectrum.
Cite
@article{arxiv.1207.0934,
title = {Universality in Multifield Inflation from String Theory},
author = {Sébastien Renaux-Petel},
journal= {arXiv preprint arXiv:1207.0934},
year = {2012}
}
Comments
4 pages. References updated compared to the version to be published in the Proceedings of the 47th Rencontres de Moriond, 10--17 March 2012, La Thuile, Italy