Massive Gravity on a Brane
Z. Chacko, M. Graesser, C. Grojean, L. Pilo

TL;DR
This paper explores a brane world model in warped AdS spacetime to create a consistent massive gravity theory, addressing long-standing issues with ghost modes and stability by analyzing graviton and radion dynamics.
Contribution
It proposes a novel brane setup that allows massive gravity at large scales without conflicting with short-distance experiments, and identifies the radion as a ghost mode.
Findings
Presence of a ghost radion mode in the low-energy spectrum.
Massive graviton becomes unstable when decoupling from the infrared brane.
Predictions match general relativity at short distances and massive gravity at large scales.
Abstract
At present no theory of a massive graviton is known that is consistent with experiments at both long and short distances. The problem is that consistency with long distance experiments requires the graviton mass to be very small. Such a small graviton mass however implies an ultraviolet cutoff for the theory at length scales far larger than the millimeter scale at which gravity has already been measured. In this paper we attempt to construct a model which avoids this problem. We consider a brane world setup in warped AdS spacetime and we investigate the consequences of writing a mass term for the graviton on a the infrared brane where the local cutoff is of order a large (galactic) distance scale. The advantage of this setup is that the low cutoff for physics on the infrared brane does not significantly affect the predictivity of the theory for observers localized on the ultraviolet…
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