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 10 May 2012, 16:00 → 17:00 Asia/Kolkata

DAA Seminar Room A269 (Colaba Campus)

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.