No consistent bimetric gravity?

TL;DR

This paper investigates the possibility of a consistent nonlinear partially massless gauge symmetry in bimetric gravity and concludes that such an extension is unlikely to exist.

Contribution

It provides a theoretical analysis showing that bimetric gravity cannot have a consistent nonlinear partially massless extension.

Findings

Bimetric gravity's consistency depends on a partially massless extension.

The paper argues that a nonlinear PM extension for bimetric gravity cannot exist.

The analysis highlights fundamental limitations in constructing nonlinear PM symmetries.

Abstract

We discuss the prospects for a consistent, nonlinear, partially massless (PM), gauge symmetry of bimetric gravity (BMG). Just as for single metric massive gravity, we show that consistency of BMG relies on it having a PM extension; we then argue that it cannot.