Speaker
Dr
Akhilesh Nautiyal
(Indian Institute of Science Education and Research Bhopal)
Description
BICEP2 has detected gravitational waves with large tensor to scalar ratio r=0.2, that is in tension with PLANCK's upper bound r<0.11 from temperature anisotropy. The tension can be resolved if the spectrum of gravitational waves is blue tilted.
The spectrum of gravitational waves generated in standard inflationary scenarios is almost scale invariant. But, if we take into account the Hawking radiation during inflation, we can have blue tilted as well as red tilted spectrum of tensor perturbations depending on the choice of observer. In this talk I will discuss the implications of modified tensor spectrum due to Hawking radiation for PLANCK, BICEP2 and other CMB experiments.
Author
Dr
Akhilesh Nautiyal
(Indian Institute of Science Education and Research Bhopal)
Co-author
Prof.
Subhendra Mohanty
(Physical Research Laboratory, ahmedabad)
