16 citations · 45 across the 4 of their papers we have counts for
6 papers · 1 filter
Black Hole Shadow Drift and Photon Ring Frequency Drift
Emmanuel Frion, Leonardo Giani, Tays Miranda
The apparent angular size of the shadow of a black hole in an expanding Universe is redshift-dependent. Since cosmological redshifts change with time - known as the redshift drift…
Impact of inhomogeneities on slowly rolling Quintessence: implications for the local variations of the fine-structure constant
Leonardo Giani, Emmanuel Frion, Oliver Fabio Piattella
We study how the evolution of a Dark Energy Quintessence fluid is modified by the presence of a matter inhomogeneity. To do so, we study linear perturbations of a flat FLRW backgro…
Quantum Effects in Cosmology
Emmanuel Frion
Quantum effects play an essential role in modern cosmology. Perhaps the most striking example comes from large-scale structures, generally assumed to originate from vacuum quantum…
Primordial Magnetogenesis in a Bouncing Universe
E. Frion, N. Pinto-Neto, S. D. P. Vitenti +1
We investigate primordial magnetogenesis and the evolution of the electromagnetic field through a quantum bounce, in a model that starts in the far past from a contracting phase wh…
Stochastic collapse
Tays Miranda, Emmanuel Frion, David Wands
We investigate cosmological models described by a scalar field with an exponential potential, and apply the stochastic formalism, which allows us to study how quantum field fluctua…
Affine quantisation of the Brans-Dicke theory: Smooth bouncing and the equivalence between the Einstein and Jordan frames
E. Frion, C. R. Almeida
In this work, we present a complete analysis of the quantisation of the classical Brans-Dicke Theory using the method of affine quantisation in the Hamiltonian description of the t…