Avoiding instabilities in antisymmetric tensor field driven inflation
  Models of inflation with antisymmetric tensor studied in the past are plagued
with ghost instability even in an unperturbed FRW background. We show that it
is possible to avoid ghosts in an unperturbed FRW background by considering the
most general kinetic term for antisymmetric tensor field. The kinetic part
acquires a new gauge symmetry violating term whose effect on perturbed modes is
to prevent the appearance of nondynamical modes, and thus avoid ghosts. For
completeness, we perform a check for gradient instability and derive the
conditions for perturbations to be free of gradient instability.
