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Features of heavy physics in the spectrum of primordial perturbations

Ana Achúcarro
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 Astrofísica da Universidade do Porto (Auditorium)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia