Warm natural inflation
  In warm inflation models there is the requirement of generating large
dissipative couplings of the inflaton with radiation, while at the same time,
not de-stabilising the flatness of the inflaton potential due to radiative
corrections. One way to achieve this without fine tuning unrelated couplings is
by supersymmetry. In this paper we show that if the inflaton and other light
fields are Pseudo-Nambu-Goldstone Bosons then the radiative corrections to the
potential are suppressed and the thermal corrections are small as long as the
temperature is below the symmetry breaking scale. In such models it is possible
to fulfill the contrary requirements of an inflaton potential which is stable
under radiative corrections and the generation of a large dissipative coupling
of the inflaton field with other light fields. We construct a warm inflation
model which gives the observed CMB-anisotropy amplitude and spectral index
where the symmetry breaking is at the GUT scale.
