Signature of Gibbons-Hawking temperature in the BICEP2 measurement of gravitational waves

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 standard inflationary models can not generate blue tilted spectrum. But, if we take into account the Hawking radiation during inflation, we can have blue tilted spectrum of tensor perturbations. In this talk, after briefly discussing CMB polarization, we will discuss the signature of Hawking radiation on B-modes and its implications for BICEP2 and PLANCK.