Warm DBI Inflation

Details Warm DBI Inflation Warm DBI Inflation

2010-11-17

arxiv.org/abs/1011.4074v2

Phys. Rev. D 83, 101301(R) (2011)

Physics

High Energy Physics

High Energy Physics - Theory

5 pages, 1 figure, IPMU-10-0199

Scientific paper

10.1103/PhysRevD.83.101301

We propose a warm inflationary model in the context of relativistic D-brane inflation in a warped throat, which has Dirac-Born-Infeld (DBI) kinetic term and is coupled to radiation through a dissipation term. The perturbation freezes at the sound horizon and the power spectrum is determined by a combination of the dissipative parameter and the sound speed parameter. The thermal dissipation ameliorates the {\it eta} problem and softens theoretical constraints from the extra-dimensional volume and from observational bounds on the tensor-to-scalar ratio. The warm DBI model can lead to appreciable non-Gaussianity of the equilateral type. As a phenomenological model, ignoring compactification constraints, we show that large-field warm inflation models do not necessarily yield a large tensor-to-scalar ratio.

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