299 citations · 924 across the 41 of their papers we have counts for
14 papers · 1 filter
formalism on the past light-cone
Giuseppe Fanizza, Giovanni Marozzi, Matheus Medeiros
We apply the gradient expansion approximation to the light-cone gauge, obtaining a separate universe picture at non-linear order in perturbation theory within this framework. There…
Gauge invariance on the light-cone: curvature perturbations and radiative degrees of freedom
Giuseppe Fanizza, Giovanni Marozzi, Matheus Medeiros
We derive the expressions on the observed light-cone for some relevant cosmological gauge invariant variables, such as the Mukhanov-Sasaki variable and - and - modes of the t…
Gravitational Wave luminosity distance in viscous cosmological models
Giuseppe Fanizza, Eliseo Pavone, Luigi Tedesco
We study the so-called Gravitational Wave luminosity distance-redshift relation during cosmological eras driven by non-perfect fluids. In particular, we show that t…
Linearized propagation equations for metric fluctuations in a general (non-vacuum) background geometry
G. Fanizza, M. Gasperini, E. Pavone +1
The linearized dynamical equation for metric perturbations in a fully general, non-vacuum, background geometry is obtained from the Hamilton variational principle applied to the ac…
Comparing the luminosity distance for gravitational waves and electromagnetic signals in a simple model of quadratic gravity
G. Fanizza, G. Franchini, M. Gasperini +1
We compute the modified friction coefficient controlling the propagation of tensor metric perturbations in the context of a generalized cosmological scenario based on a theory of g…
Cutting out the cosmological middle man: General Relativity in the light-cone coordinates
Ermis Mitsou, Giuseppe Fanizza, Nastassia Grimm +1
Analytical computations in relativistic cosmology can be split into two sets: time evolution relating the initial conditions to the observer's light-cone and light propagation to o…
The Cosmological Perturbation Theory on the Geodesic Light-Cone background
Giuseppe Fanizza, Giovanni Marozzi, Matheus Medeiros +1
Inspired by the fully non-linear Geodesic Light-Cone (GLC) gauge, we consider its analogous set of coordinates which describes the unperturbed Universe. Given this starting point,…
Generalized covariant prescriptions for averaging cosmological observables
Giuseppe Fanizza, Maurizio Gasperini, Giovanni Marozzi +1
We present two new covariant and general prescriptions for averaging scalar observables on spatial regions typical of the observed sources and intersecting the past light-cone of a…
Non-linear general relativistic effects in the observed redshift
Giuseppe Fanizza, Jaiyul Yoo, Sang Gyu Biern
We present the second-order expression for the observed redshift, accounting for all the relativistic effects from the light propagation and from the frame change at the observer a…
Observed Angles and Geodesic Light-Cone Coordinates
Ermis Mitsou, Fulvio Scaccabarozzi, Giuseppe Fanizza
We discuss the interpretation of the angles in the Geodesic Light-Cone (GLC) coordinates. In particular, we clarify the way in which these angles can be identified with the observe…
Geodesic-light-cone coordinates and the Bianchi I spacetime
Pierre Fleury, Fabien Nugier, Giuseppe Fanizza
The geodesic-light-cone (GLC) coordinates are a useful tool to analyse light propagation and observations in cosmological models. In this article, we propose a detailed, pedagogica…
Anisotropic expansion of the Universe and generation of quantum interference in light propagation
G. Fanizza, L. Tedesco
We investigate the electrodynamic in a Bianchi type I cosmological model. This scenario reveals the possibility that photons, during their traveling, can make quantum interference.…
Inhomogeneous and anisotropic Universe and apparent acceleration
G. Fanizza, L. Tedesco
In this paper we introduce a LTB-Bianchi I (plane symmetric) model of Universe. We study and solve Einstein field equations. We investigate the effects of such model of Universe in…
Discriminating different models of luminosity-redshift distribution
L. Cosmai, G. Fanizza, M. Gasperini +1
The beginning of the cosmological phase bearing the direct kinematic imprints of supernovae dimming may significantly vary within different models of late-time cosmology, even if s…