Constraints on the spectral index for the inflation models in string landscape
High Energy Physics - Theory
2008-11-26 v2 Astrophysics
Abstract
We conjecture that the inflation models with trans-Planckian excursions in the field space should be in the swampland. We check this conjecture in a few examples and investigate the constraints on the spectral index for the slow-roll inflation model in string landscape where the variation of inflaton during the period of inflation is less than the Planck scale . A red primordial power spectrum with a lower bound on the spectral index is preferred. Both the tensor-scalar ratio and the running can be ignored.
Keywords
Cite
@article{arxiv.0706.2215,
title = {Constraints on the spectral index for the inflation models in string landscape},
author = {Qing-Guo Huang},
journal= {arXiv preprint arXiv:0706.2215},
year = {2008}
}