SU(2,1) / (SU(2) x U(1)) B-L Higgs Inflation
  We present a realization of Higgs inflation within Supergravity which is
largely tied to the existence of a pole of order two in the kinetic term of the
inflaton field. This pole arises due to the selected Kaehler potential which
parameterizes the SU(2,1) / (SU(2) x U(1)) manifold with scalar curvature
R_{21}=-6/N. The associated superpotential includes, in addition to the Higgs
superfields, a stabilizer superfield, respects a B-L gauge and an R symmetries
and contains the first allowed nonrenormalizable term. If the coefficient of
this term is almost equal to that of the others within about 10^-5 and N=2, the
inflationary observables can be done compatible with the present data. The
tuning can be eluded if we modify the Kaehler potential associated with the
manifold above. In this case, inflation can be realized with just
renormalizable superpotential terms and results to higher tensor-to-scalar
ratios as N approaches its maximum at N~80.
