  We study the quantization of a simple model of antisymmetric tensor field
with spontaneous Lorentz violation in curved spacetime. We evaluate the 1-loop
corrections at first order of metric perturbation, using a general covariant
effective action approach. We revisit the issue of quantum equivalence, and
find that it holds for non-Lorentz-violating modes but breaks down for Lorentz
violating modes.

General Relativity and Quantum Cosmology;High Energy Physics - Theory