Slow-roll inflation with a Gauss-Bonnet correction - INSPIRE

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Slow-roll inflation with a Gauss-Bonnet correction

Zong-Kuan Guo
(
- Bielefeld U.
)
,
Dominik J. Schwarz
(
- Bielefeld U.
)

Jan, 2010

6 pages

Published in:

Phys.Rev.D 81 (2010) 123520

e-Print:

1001.1897 [hep-th]

DOI:

10.1103/PhysRevD.81.123520

Report number:

BI-TP-2010-01

View in:

ADS Abstract Service

reference search149 citations

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Abstract: (arXiv)

We consider slow-roll inflation for a single scalar field with an arbitrary potential and an arbitrary nonminimal coupling to the Gauss-Bonnet term. By introducing a combined hierarchy of Hubble and Gauss-Bonnet flow functions, we analytically derive the power spectra of scalar and tensor perturbations. The standard consistency relation between the tensor-to-scalar ratio and the spectral index of tensor perturbations is broken. We apply this formalism to a specific model with a monomial potential and an inverse monomial Gauss-Bonnet coupling and constrain it by the 7-year Wilkinson Microwave Anisotropy Probe data. The Gauss-Bonnet term with a positive (or negative) coupling may lead to a reduction (or enhancement) of the tensor-to-scalar ratio and hence may revive the quartic potential ruled out by recent cosmological data.

Note:

7 pages, 2 figures, RevTeX, references added, published version

98.80.Jk
98.80.Cq
04.62.+v
perturbation: tensor
power spectrum: scalar
coupling: nonminimal
field theory: scalar
Gauss-Bonnet term
inflation
slow-roll approximation

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Figures(2)

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