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1. chinaXiv:201709.00163 [pdf]

Inflation coupled to a Gauss-Bonnet term

Peng-Xu Jiang; Jian-Wei Hu; Zong-Kuan Guo
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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.

submitted time 2017-09-27 Hits410Downloads238 Comment 0

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