SEMINAR: Inflation, BICEP2, and an interesting discrepancy with Planck

Thursday March 27 2014, 12:00pm -  Seminar room

Speaker: Prof. Lorenzo Sorbo (U.Mass Amherst & TPT-CEA Paris)

Abstract: The BICEP2 collaboration has reported a strong B mode signal in the CMB polarization, which is well fit by a tensor-to-scalar ratio of r ~ 0.2.

In this talk I will first discuss the implications of such a large value of r for inflationary model building, in particular in UV complete theories. Then I will move on to one intriguing discrepancy between the observed best fit value for r=0.2 obtained by BICEP2 and the upper bound r<0.11 quoted by Planck. I will discuss two scenarios where this discrepancy could be of primordial origin. The first scenario is based on a step in the amplitude of the primordial scalar perturbations, the second on an anticorrelation between scalar and tensor modes.


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