DBI Inflation using a One-Parameter Family of Throat Geometries

Details DBI Inflation using a One-Parameter Family of Throat Geometries DBI Inflation using a One-Parameter Family of Throat Geometries

2007-10-10

arxiv.org/abs/0710.2009v3

JCAP 0802:012,2008

Physics

High Energy Physics

High Energy Physics - Theory

17 pages, 10 figures; v2: section 4 expanded, references added; v3: typos fixed

Scientific paper

10.1088/1475-7516/2008/02/012

We demonstrate the possibility of examining cosmological signatures in the DBI inflation setup using the BGMPZ solution, a one-parameter family of geometries for the warped throat which interpolate between the Maldacena-Nunez and Klebanov-Strassler solutions. The warp factor is determined numerically and subsequently used to calculate cosmological observables including the scalar and tensor spectral indices, for a sample point in the parameter space. As one moves away from the KS solution for the throat the warp factor is qualitatively different, which leads to a significant change for the observables, but also generically increases the non-Gaussianity of the models. We argue that the different models can potentially be differentiated by current and future experiments.

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