Author:
Montefalcone Gabriele,Aragam Vikas,Visinelli Luca,Freese Katherine
Abstract
Abstract
Warm natural inflation is studied for the case of the original cosine potential. The
radiation bath during inflation induces a dissipation (friction) rate in the equation of motion
for the inflaton field, which can potentially reduce the field excursion needed for an
observationally viable period of inflation. We examine if the dissipation thus provides a
mechanism to avoid the large decay constant f ≳ M
pl of cold cosine natural
inflation. Whereas temperature independent dissipation has previously been shown to alleviate the
need for a trans-Planckian decay constant f, we illustrate here the difficulties of
accommodating a significantly sub-Planckian decay constant (f < 10-1
M
pl) for the
case of a temperature dependent dissipation rate in the form Γ ∝ Tc
, with
c = {1,3}. Such dissipation rates represent physically well-motivated constructions in the
literature. For each model, we map its location in the r-ns
plane and compare with cosmic
microwave background (CMB) data. For c = 1 (c = 3), we find that agreement with CMB data requires
that dissipation be in the weak (moderate) regime and that the minimum allowed value of the decay
constant in the potential is f
min = 0.3 (0.8) M
pl, respectively.
Subject
Astronomy and Astrophysics
Cited by
17 articles.
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