144 citations · 554 across the 11 of their papers we have counts for
11 papers
Redshift evolution of cosmic birefringence in CMB anisotropies
Matteo Galaverni, Fabio Finelli, Daniela Paoletti
We study the imprints of a cosmological redshift-dependent pseudoscalar field on the rotation of cosmic microwave background (CMB) linear polarization generated by a coupling $…
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…
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…
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…
Cosmological birefringence constraints from CMB and astrophysical polarization data
M. Galaverni, G. Gubitosi, F. Paci +1
Cosmological birefringence is a rotation of the polarization plane of photons coming from sources of astrophysical and cosmological origin. The rotation can also depend on the ener…
Limits on Cosmological Birefringence from the Ultraviolet Polarization of Distant Radio Galaxies
Sperello di Serego Alighieri, Fabio Finelli, Matteo Galaverni
We report on an update of the test on the rotation of the plane of linear polarization for light traveling over cosmological distances, using a comparison between the measured dire…