Hamiltonian formalism of particular bimetric gravity model

In this short note, we perform the Hamiltonian analysis of bimetric gravity with one particular form of potential between two metrics. We find that this theory has eight secondary constraints. We identify four constraints that are the first-class constraints on condition when the interaction term obeys some specific condition. We show that for the form of the potential studied in this paper, this condition is obeyed, and hence we can interpret these first-class constraints as generators of the diagonal diffeomorphism. DOI: 10.1103/PhysRevD.87.084017