Local and non-local features in the primordial power spectrum and associated bi-spectra

by Dr. Dhiraj Kumar Hazra (Harish-Chandra Research Institute, Allahabad)

Thursday, May 10, 2012 from 16:00 to 17:00 (Asia/Kolkata)
at Colaba Campus ( DAA Seminar Room A269 )

TIFR

Description

This talk is largely divided into two parts. In the first half of the talk, I shall discuss the generation of localized as well as non-local features (i.e. characteristic and repeated patterns that extend over a wide range of scales)
in the inflationary scalar power spectrum that lead to a better fit to the CMB data than the conventional power law spectrum.
In the second half, I shall discuss the bi-spectra that result in such scenarios, and how they compare with the current observational limits on the parameter f_NL.
Towards the end, time permitting, I shall also briefly discuss the effects of preheating in single field inflationary models on the evolution of the bi-spectrum.