Loop Corrections to Cosmological Perturbations in Multi-field Inflationary Models

Details Loop Corrections to Cosmological Perturbations in Multi-field Inflationary Models Loop Corrections to Cosmological Perturbations in Multi-field Inflationary Models

2009-05-04

arxiv.org/abs/0905.0405v3

JCAP 0907:042,2009

Physics

High Energy Physics

High Energy Physics - Theory

21 pages, 7 figures; v2, typos corrected, ref added; v3 typos corrected, version for publishing in jcap

Scientific paper

10.1088/1475-7516/2009/07/042

We investigate one-loop quantum corrections to the power spectrum of adiabatic perturbation from entropy modes/adiabatic mode cross-interactions in multiple DBI inflationary models. We find that due to the non-canonical kinetic term in DBI models, the loop corrections are enhanced by slow-varying parameter $\epsilon$ and small sound speed $c_s$. Thus, in general the loop-corrections in multi-DBI models can be large. Moreover, we find that the loop-corrections from adiabatic/entropy cross-interaction vertices are IR finite.

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