DBI Inflation using a One-Parameter Family of Throat Geometries

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.

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

References in corpus (5)

• A Microscopic Limit on Gravitational Waves from D-brane Inflation
• Phenomenology of D-Brane Inflation with General Speed of Sound
• Multifield DBI Inflation and Non-Gaussianities
• Inflation from Wrapped Branes
• Observing the Geometry of Warped Compactification via Cosmic Inflation

Cited by in corpus (9)

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• N-flation from multiple DBI type actions
• DBI-Curvaton
• Quintessence and phantom dark energy from ghost D-branes
• Warped Wilson Line DBI Inflation
• Gravitational Wave Constraints on Multi-Brane Inflation
• A Self-gravitating Dirac-Born-Infeld Global Monopole
• Brane Inflation and the Overshoot Problem