  It is known that the covariant graviton two-point function in de Sitter
spacetime is infrared divergent for some choices of gauge parameters. On the
other hand it is also known that there are no infrared divergences requiring an
infrared cutoff for the physical graviton two-point function for this spacetime
in the transverse-traceless-synchronous gauge in the global coordinate system.
We show in this paper that the covariant graviton Wightman two-point function
with two gauge parameters is equivalent to the physical one in the global
coordinate system in the sense that they produce the same two-point function of
any local gauge-invariant tensor linear in the graviton field such as the
linearized Weyl tensor. This confirms the fact, pointed out decades ago, that
the infrared divergences of the graviton two-point function in the covariant
gauge for some choices of gauge parameters are gauge artifact in the sense that
they do not contribute to the Wightman two-point function of any local gauge
invariant tensor field in linearized theory.
