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On the absence of ghosts in quadratic bigravity
Published 24 Nov 2023 in gr-qc, astro-ph.CO, and hep-th | (2311.14799v2)
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.
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