DBI Inflation using a One-Parameter Family of Throat Geometries

Gmeiner, Florian
White, Chris D.
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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.
Comment: 17 pages, 10 figures; v2: section 4 expanded, references added; v3: typos fixed
High Energy Physics - Theory, Astrophysics, High Energy Physics - Phenomenology