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Signatures of vector field production during inflation

by Dr. Marco Peloso (Universita' del Minnesota e INFN - Padova)

Jul 16, 2013 from 03:00 PM to 05:30 PM

Where Aula Teorici - Irnerio

Contact Name Dr. Gian Paolo Vacca

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Abstract: We study the phenomenological limits on inflationary models due to possible vector field production during inflation. In the first part of the talk we show that an axion inflaton with a decay constant of the order of 10^(16) GeV gives rise to a large non-gaussianity of the primordial perturbations, to observable chiral gravity waves at interferometers, and to a large amount of primordial black holes. In the second part of the talk we discuss a different model (first studied by Ratra in the context of magnetogensis), characterized by a dilation-like kinetic coupling between the inflaton and a vector field. This model results in non-gaussianity and broken statistical isotropy of the primordial perturbations at a level which typically exceeds the observational bounds.