The SUSY hybrid inflation model is found to dissipate radiation during the
inflationary period. Analysis is made of parameter regimes in which these
dissipative effects are significant. The scalar spectral index, its running,
and the tensor-scalar ratio are computed in the entire parameter range of the
model. A clear prediction for strong dissipative warm inflation is found for
n_S-1 \simeq 0.98 and a low tensor-scalar ratio much below 10^{-6}. The strong
dissipative warm inflation regime also is found to have no \eta-problem and
with the field amplitude much below the Planck scale. As will be discussed,
this has important theoretical implications in permitting a much wider variety
of SUGRA extensions to the basic model.Comment: paragraph added at the end of section V; references added; accepted
for publication in Phys. Rev.
