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Résumé |
I will show that, in four-dimensional spacetimes with an arbitrary
Einstein metric, with and without a cosmological constant, perturbative dynamical degrees of
freedom in generic quadratic-curvature gravity can be decoupled into massless and massive
parts. The massive part has the structure iden-ical to, modulo the
over-all sign, the non-Fierz–Pauli-type massive gravity, and a further decomposition into the
spin-2 and spin-0 sectors can be done. The equivalence at the level of equations of motion
allows us to translate various observational bounds on the mass of extra fields into constraints
on the coupling constants in quadratic curvature gravity.
We find that the Weyl-squared term is confronting two apparently contradicting constraints on
massive spin-2 fields from the inverse-square law experiments and observations of spinning
black holes. based on arXiv:1906.12055 |
