Apr 18 – 22, 2011
Palais des Papes, Avignon
Europe/Paris timezone

Nonstandard tensor modes from a pseudoscalar inflaton

Apr 18, 2011, 2:30 PM
20m
Chambre du Trésorier (Palais des Papes, Avignon)

Chambre du Trésorier

Palais des Papes, Avignon

Speaker

Lorenzo Sorbo (University of Massachusetts, Amherst)

Description

In many models of inflation, the inflaton is a pseudoscalar field that is a potential source of parity violation. I will discuss a natural mechanism allowing to transfer parity violation from the inflaton into the Cosmic Microwave Background (CMB). A pseudoscalar inflaton naturally interacts with gauge fields through an axion-like coupling. Through this coupling, the rolling inflaton induces the production of quanta of the gauge field, that in their turn source the tensor components of the metric perturbations. Due to the parity-violating nature of the system, non-vanishing TB and EB correlation functions in the CMB are generated. I will also discuss how the tensor modes generated this way might be directly detected by gravitational wave interferometers such as advanced LIGO.

Primary author

Lorenzo Sorbo (University of Massachusetts, Amherst)

Presentation materials