Dissipation during inflation: the warm inflationary scenario
by
Mar Bastero-Gil(Granada University)
→
Europe/Berlin
313
313
Description
In this talk, we will review the main aspects of the warm inflation
scenario, focusing on the inflationary dynamics and the predictions
related to the primordial spectrum of perturbations, to be compared
with the recent cosmological observations. Due to the extra friction
term introduced in the inflaton background
evolution generated by the dissipative dynamics, inflation can take
place generically for smaller values of the field, and larger values
of couplings and masses. When the dissipative
dynamics dominates over the expansion, in the so-called strong
dissipative regime, inflation proceeds with sub-planckian inflaton
values. Models can be naturally embedded into a supergravity framework, with
sugra corrections suppressed by the Planck mass now under control, for
a larger class of K\"ahler potentials. In particular, this provides a
simpler solution to the ``eta'' problem in supersymmetric hybrid
inflation, without restricting the K\"ahler potentials compatible with
inflation. For chaotic models dissipation leads
to a smaller prediction for the tensor-to-scalar ratio and a less
tilted spectrum when compared to the cold inflation scenario. We find
in particular that a small component of dissipation renders the
quartic model now consistent with the current CMB data.
