Instituut-Lorentz for theoretical physics, Universiteit Leiden
I will discuss cosmic inflation with a single light field in the presence of other, very massive fields. The inflationary trajectories are generically not straight. Whenever there is a turn in the trajectory, very heavy fields (with masses much larger than the Hubble scale) can leave a distinctive imprint on the spectrum of primordial perturbations. The main effect is a reduction in the speed of sound of the adiabatic perturbations, which leads to features in the power spectrum correlated with an enhancement of non-gaussianity.
2012 September 26, 13:30
Centro de Astrofķsica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto