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Paper   IPM / P / 7338
School of Physics
  Title:   DBI in the Sky : Non-Gaussianity from Inflation with A Speed Limit
1.  M. Alishahiha
2.  Eva Silverstein
3.  David Tong
  Status:   Published
  Journal: Phys. Rev. D
  No.:  12
  Vol.:  70
  Year:  2004
  Pages:   123505
  Supported by:  IPM
We analyze the spectrum of density perturbations generated in models of the recently discovered "D-cceleration" mechanism of inflation. In this scenario, strong coupling quantum field theoretic effects sum to provide a DBI-like action for the inflaton. We show that the model has a strict lower bound on the non-Gaussianity of the CMBR power spectrum at an observable level, and is thus falsifiable. This in particular observationally distinguishes this mechanism from traditional slow roll inflation generated by weakly interacting scalar fields. The model also favors a large observable tensor component to the CMBR spectrum.

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