On the absence of ghosts in quadratic bigravity
arXiv:2311.14799 · doi:10.1088/1475-7516/2024/03/016
Abstract
An extension of the bimetric theory of gravity is considered that includes quadratic Ricci curvature terms associated with each metric. The issue of the Boulware-Deser ghost is analyzed. The Hamiltonian constraint is derived and the existence of a secondary constraint is shown, proving that the theory is ghost-free.
13 pages, matches published version
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