DBI in the sky: Non-Gaussianity from inflation with a speed limit
Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D, Particles, fields, gravitation, and cosmology2004Vol. 70(12)
Citations Over TimeTop 1% of 2004 papers
Abstract
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 Dirac-Born-Infeld--like action for the inflaton. We show that the model has a strict lower bound on the non-Gaussianity of the cosmic microwave background radiation 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 cosmic microwave background radiation spectrum.
Related Papers
- → Cosmic microwave background bispectrum and inflation(2000)178 cited
- → New shapes of primordial non-Gaussianity from quasi-single field inflation with multiple isocurvatons(2019)23 cited
- → Non-Gaussian perturbations in hybrid inflation(2004)68 cited
- → CMBPol Mission Concept Study: Probing Inflation with CMB Polarization(2008)204 cited