Power spectra from an inflaton coupled to the Gauss-Bonnet term

Details Power spectra from an inflaton coupled to the Gauss-Bonnet term Power spectra from an inflaton coupled to the Gauss-Bonnet term

2009-07-02

arxiv.org/abs/0907.0427v2

Phys. Rev. D80: 063523, 2009

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, 4 figures, RevTeX, references added, published version

Scientific paper

10.1103/PhysRevD.80.063523

We consider power-law inflation with a Gauss-Bonnet correction inspired by string theory. We analyze the stability of cosmological perturbations and obtain the allowed parameter space. We find that for GB-dominated inflation ultra-violet instabilities of either scalar or tensor perturbations show up on small scales. The Gauss-Bonnet correction with a positive (or negative) coupling may lead to a reduction (or enhancement) of the tensor-to-scalar ratio in the potential-dominated case. We place tight constraints on the model parameters by making use of the WMAP 5-year data.

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