Inhomogeneous Reheating Scenario with DBI fields

Details Inhomogeneous Reheating Scenario with DBI fields Inhomogeneous Reheating Scenario with DBI fields

2010-05-13

arxiv.org/abs/1005.2298v3

Physics

High Energy Physics

High Energy Physics - Theory

7pages, 4eps figures, some refences added and updated, published by JCAP

Scientific paper

10.1088/1475-7516/2010/08/024

We discuss a new mechanism which can be responsible for the origin of the primordial perturbation in inflationary models, the inhomogeneous DBI reheating scenario. Light DBI fields fluctuate during inflation, and finally create the density perturbations through modulation of the inflation decay rate. In this note, we investigate the curvature perturbation and its non-Gaussianity from this new mechanism. Presenting generalized expressions for them, we show that the curvature perturbation not only depends on the particular process of decay but is also dependent on the sound speed $c_s$ from the DBI action. More interestingly we find that the non-Gaussianity parameter $f_{NL}$ is independent of $c_s$. As an application we exemplify some decay processes which give a viable and detectable non-Gaussianity. Finally we find a possible connection between our model and the DBI-Curvaton mechanism.

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