  Graviton propagator diverges in certain gauges in de Sitter spacetime. We
address this problem in this work by generalizing the infinitesimal BRST
transformations in de Sitter spacetime to finite field-dependent BRST (FFBRST)
transformations. These FFBRST transformations are symmetry of the classical
action, but do not leave path integral measure invariant for the graviton
theory in de Sitter spacetime. Due to the non-trivial Jacobian of such finite
transformation the path integral measure changes and hence FFBRST
transformation is capable of relating theories in two different gauges. We
explicitly construct FFBRST transformation which relates theory with diverging
graviton two-point function to theory with infrared (IR) finite graviton. The
FFBRST transformation thus establishes that divergence in graviton two-point
function may be only a gauge artifact.
