Example：10.1021/acsami.1c06204 or Chem. Rev., 2007, 107, 2411-2502
Quantization of gravity in spherical harmonic basis Physical Review D (IF5.296), Pub Date : 2021-10-19, DOI: 10.1103/physrevd.104.086023 Renata Kallosh
We perform canonical quantization of gravity in the background of a Schwarzschild black hole in the generalized Regge-Wheeler gauge proposed in Kallosh and Rahman [Quantization of gravity in the black hole background, Phys. Rev. D104, 086008 (2021)]. We find that the Hamiltonian at the quadratic level is unitary and ghost-free. Two canonical degrees of freedom are associated with Zerilli-Moncrief and Cunningham-Price-Moncrief functions of the metric perturbations. The part of the Hamiltonian vanishes. This quantization with the unitary Hamiltonian for gravity is valid also in Minkowski space in spherical coordinates.