Equivalence of two solutions of physical massive gravity

Abstract

We study some aspects of linearized gravity as gauge theory, with massive deformation. Recently, it has been shown that there are two distinct solutions, which represent physical massive gravity. The purpose of the present work is to show that these two seemingly discrete solutions are equivalent at the level of generating functional. The significance of this simple work lies in the fact that one solution represents physical massive gravity at Fierz–Pauli (FP) point and the other outside the FP point.