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gr-qc2021
Jordan and Einstein frames Hamiltonian analysis for FLRW Brans-Dicke theory
Matteo Galaverni, Gabriele Gionti, S. J.
We analyze Hamiltonian equivalence between Jordan and Einstein frames considering a mini-superspace model of flat Friedmann-Lemaitre-Robertson-Walker (FLRW) Universe in Brans-Dicke…
gr-qc2021★ 7 cited
Jordan and Einstein Frames from the perspective of Hamiltonian Brans-Dicke theory
Matteo Galaverni, Gabriele Gionti S. J.
We carefully perform a Hamiltonian Dirac's constraint analysis of Brans-Dicke theory with Gibbons-Hawking-York (GHY) boundary term. The Poisson brackets are comput…
gr-qc2020★ 10 cited
Photon helicity and quantum anomalies in curved spacetimes
Matteo Galaverni, Gabriele Gionti S. J.
We compare several definitions of photon helicity (magnetic, electric, electromagnetic) present in literature. In curved spacetime quantum anomalies can spoil helicity conservation…