Inflation in Gauss-Bonnet Brane Cosmology

Details Inflation in Gauss-Bonnet Brane Cosmology Inflation in Gauss-Bonnet Brane Cosmology

2003-03-07

arxiv.org/abs/astro-ph/0303168v3

Phys.Rev. D67 (2003) 103510

Astronomy and Astrophysics

Astrophysics

16 pages, 4 figures. Extended introduction. In press, Phys. Rev. D

Scientific paper

10.1103/PhysRevD.67.103510

The effect of including a Gauss-Bonnet contribution in the bulk action is investigated within the context of the steep inflationary scenario. When inflation is driven by an exponential inflaton field, this Gauss-Bonnet term allows the spectral index of the scalar perturbation spectrum to take values in the range 0.944 and 0.989, thereby bringing the scenario in closer agreement with the most recent observations. Once the perturbation spectrum is normalized to the microwave background temperature anisotropies, the value of the spectral index is determined by the Gauss-Bonnet coupling parameter and the tension of the brane and is independent of the logarithmic slope of the potential.

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