Primordial Trispectrum from Entropy Perturbations in Multifield DBI Model

Details Primordial Trispectrum from Entropy Perturbations in Multifield DBI Model Primordial Trispectrum from Entropy Perturbations in Multifield DBI Model

2009-03-11

arxiv.org/abs/0903.1920v4

JCAP 0908:012,2009

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

17pages, 7 figures, version to appear in JCAP

Scientific paper

10.1088/1475-7516/2009/08/012

We investigate the primordial trispectra of the general multifield DBI inflationary model. In contrast with the single field model, the entropic modes can source the curvature perturbations on the super horizon scales, so we calculate the contributions from the interaction of four entropic modes mediating one adiabatic mode to the trispectra, at the large transfer limit ($T_{RS}\gg1$). We obtained the general form of the 4-point correlation functions, plotted the shape diagrams in two specific momenta configurations, "equilateral configuration" and "specialized configuration". Our figures showed that we can easily distinguish the two different momenta configurations.

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