Speaker
Guillem Domenech
(uni. heidelberg)
Description
The latest Planck’s analysis of the power spectrum finds 10% more lensing smoothing than predicted by LCDM at 2 sigma. If it is not a statistical fluke, it could indicate new physics that mimick the smoothing effect of lensing. What could that be and how was generated? First, I will show you that oscillations in the primordial power spectrum with the same frequency as the acoustic peaks but out of phase, resemble the effects of lensing. Then, I will focus on the general mechanisms that could have created these oscillations during inflation and we will see that it is not that easy. Nevertheless, I will provide you with a concrete example that works: a bump in the sound speed of scalar perturbations.
