DBI in the Sky

DBI in the Sky

March 31, 2008 | Mohsen Alishahiha, Eva Silverstein and David Tong
The paper analyzes the spectrum of density perturbations generated in models of the recently discovered "D-celeeration" mechanism of inflation. This mechanism involves strong coupling quantum field theoretic effects that lead to a Dirac-Born-Infeld (DBI) action for the inflaton, resulting in a non-Gaussian power spectrum of the cosmic microwave background radiation (CMBR) at an observable level. The model is shown to be falsifiable and observationally distinguishable from traditional slow roll inflation. The analysis also favors a large observable tensor component to the CMBR spectrum. The paper reviews the D-celeeration mechanism, derived the equations for Gaussian perturbations, and computed the non-Gaussian corrections to the power spectrum. The results indicate that the model requires a large curvature radius of the warped throat and an anisotropic compactification, with the inflaton VEV being of the order of the Planck scale. The paper concludes with a discussion of the model's predictions and future directions.The paper analyzes the spectrum of density perturbations generated in models of the recently discovered "D-celeeration" mechanism of inflation. This mechanism involves strong coupling quantum field theoretic effects that lead to a Dirac-Born-Infeld (DBI) action for the inflaton, resulting in a non-Gaussian power spectrum of the cosmic microwave background radiation (CMBR) at an observable level. The model is shown to be falsifiable and observationally distinguishable from traditional slow roll inflation. The analysis also favors a large observable tensor component to the CMBR spectrum. The paper reviews the D-celeeration mechanism, derived the equations for Gaussian perturbations, and computed the non-Gaussian corrections to the power spectrum. The results indicate that the model requires a large curvature radius of the warped throat and an anisotropic compactification, with the inflaton VEV being of the order of the Planck scale. The paper concludes with a discussion of the model's predictions and future directions.
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