DBI N-flation

Abstract

We investigate DBI inflation using $N$ multiple branes and show how the configuration is equivalent to a single wrapped $D5$-brane with flux. We then show how 1/N corrections can be implemented, and we examine the sound speed and levels of non-Gaussianities in two distinct cases. For models with constant warping we find that the non-Gaussian amplitude is bounded from above (as a function of $\gamma$). For $AdS$ backgrounds we find that the signature is generally large and positive, although is no longer globally defined over the full phase space. We then investigate an inflationary mechanism using a representation cascade, whereby the transition from a reducible representation to the irrep drives inflation.

33 pages, 8 figures. References added and typos corrected. Submitted to JHEP

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• Primordial Non-Gaussianities of General Multiple Field Inflation
• On Classification of Models of Large Local-Type Non-Gaussianity
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• Quantum modes in DBI inflation: exact solutions and constraints from vacuum selection
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• "Old" Locked Inflation
• Bounds on Tensor wave and Twisted Inflation
• Spinflation from Geometric Tachyon
• Non-relativistic Matrix Inflation
• Multi-brid DBI Inflation