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arXiv · 0710.2009

DBI Inflation using a One-Parameter Family of Throat Geometries

Florian Gmeiner·Chris D. White
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Abstract

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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Florian Gmeiner, Chris D. White. 2008-04-06. DBI Inflation using a One-Parameter Family of Throat Geometries. https://doi.org/10.1088/1475-7516%2F2008%2F02%2F012

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