Warm DBI Inflation

Abstract

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.

5 pages, 1 figure, IPMU-10-0199

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Cited by in corpus (49)

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• Power spectrum for inflation models with quantum and thermal noises
• Warm inflation as a way out of the swampland
• Shear viscous effects on the primordial power spectrum from warm inflation
• Warm Inflation in the light of Swampland Criteria
• A note on Single-field Inflation and the Swampland Criteria
• Towards a reliable effective field theory of inflation
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• The warm inflation story
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• Dynamical and observational constraints on the Warm Little Inflaton scenario
• Warming up brane-antibrane inflation
• Warm Little Inflaton becomes Cold Dark Matter
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• Extension of warm inflation to noncanonical scalar fields
• Tachyon Warm-Logamediate Inflationary Universe Model in High Dissipative Regime
• Warm Little Inflaton becomes Dark Energy
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