Can I read Bi-gravity with a Single Graviton on EtoBox?

Bi-gravity with a Single Graviton by Alexandrov, Sergei; Speziale, Simone is a scholarly article available to read on EtoBox.

What is Bi-gravity with a Single Graviton about?

We analyze a bi-gravity model based on the first order formalism, having as fundamental variables two tetrads but only one Lorentz connection. We show that on a large class of backgrounds its linearization agrees with general relativity. At the non-linear level, additional degrees of freedom appear, and we reveal the mechanism hiding them around the special backgrounds. We further argue that they do not contain a massive graviton, nor the Boulware-Deser ghost. The model thus propagates only one graviton, whereas the nature of the additional degrees of freedom remains to be investigated. We also present a foliation-preserving deformation of the model, which keeps all symmetries except time diffeomorphisms and has three degrees of freedom.

Author

Alexandrov, Sergei; Speziale, Simone

Published

2019

Language

EN