Inflation coupled to a Gauss-Bonnet term
High Energy Physics - Theory
2013-12-05 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
The newly released Planck CMB data place tight constraints on slow-roll inflationary models. Some of commonly discussed inflationary potentials are disfavored due mainly to the large tensor-to-scalar ratio. In this paper we show that these potentials may be in good agreement with the Planck data when the inflaton has a non-minimal coupling to the Gauss-Bonnet term. Moreover, such a coupling violates the consistency relation between the tensor spectral index and tensor-to-scalar ratio. If the tensor spectral index is allowed to vary freely, the Planck constraints on the tensor-to-scalar ratio are slightly improved.
Keywords
Cite
@article{arxiv.1310.5579,
title = {Inflation coupled to a Gauss-Bonnet term},
author = {Peng-Xu Jiang and Jian-Wei Hu and Zong-Kuan Guo},
journal= {arXiv preprint arXiv:1310.5579},
year = {2013}
}
Comments
7 pages, 2 figures, references added