New Higgs Inflation in a No-Scale Supersymmetric SU(5) GUT
  Higgs inflation is attractive because it identifies the inflaton with the
electroweak Higgs boson. In this work, we construct a new class of
supersymmetric Higgs inflationary models in the no-scale supergravity with an
SU(5) GUT group. Extending the no-scale Kahler potential and SU(5) GUT
superpotential, we derive a generic potential for Higgs inflation that includes
the quadratic monomial potential and a Starobinsky-type potential as special
limits. This type of models can accommodate a wide range of the
tensor-to-scalar ratio $r = O(10^{-3}-10^{-1})$, as well as a scalar spectral
index $n_s \sim 0.96$.
