Slow-roll inflation with a Gauss-Bonnet correction

Guo Z-K, Schwarz D (2010)
Phys.Rev.D 81(12).

Journal Article | Published | English

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Abstract
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.
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Guo Z-K, Schwarz D. Slow-roll inflation with a Gauss-Bonnet correction. Phys.Rev.D. 2010;81(12).
Guo, Z. - K., & Schwarz, D. (2010). Slow-roll inflation with a Gauss-Bonnet correction. Phys.Rev.D, 81(12).
Guo, Z. - K., and Schwarz, D. (2010). Slow-roll inflation with a Gauss-Bonnet correction. Phys.Rev.D 81.
Guo, Z.-K., & Schwarz, D., 2010. Slow-roll inflation with a Gauss-Bonnet correction. Phys.Rev.D, 81(12).
Z.-K. Guo and D. Schwarz, “Slow-roll inflation with a Gauss-Bonnet correction”, Phys.Rev.D, vol. 81, 2010.
Guo, Z.-K., Schwarz, D.: Slow-roll inflation with a Gauss-Bonnet correction. Phys.Rev.D. 81, (2010).
Guo, Zong-Kuan, and Schwarz, Dominik. “Slow-roll inflation with a Gauss-Bonnet correction”. Phys.Rev.D 81.12 (2010).
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