299 citations · 924 across the 41 of their papers we have counts for
41 papers
Nonlinear Relativistic Effects on Cosmological Redshift Drift
Pierre Béchaz, Giuseppe Fanizza, Giovanni Marozzi +1
Using a fully gauge-invariant approach, we compute for the first time in the literature relativistic effects on the redshift drift up to second order in cosmological perturbation t…
Freeze-out and spectral running of primordial gravitational waves in viscous cosmology
Giuseppe Fanizza, Eliseo Pavone, Luigi Tedesco
We investigate the impact of shear viscosity on the propagation of primordial gravitational waves (pGW) after inflation. Without assuming a specific inflationary scenario we focus…
A Light-Cone Approach to Higher-Order Cosmological Observables
Pierre Béchaz, Giuseppe Fanizza, Giovanni Marozzi +1
We develop a second-order cosmological perturbation theory on a background geometry expressed in terms of light-cone coordinates, extending the first-order analyses available in th…
The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
Eleonora Di Valentino, Jackson Levi Said, Adam Riess +533
The standard model of cosmology has provided a good phenomenological description of a wide range of observations both at astrophysical and cosmological scales for several decades.…
Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data
P. Conzinu, G. Fanizza, M. Gasperini +3
We discuss a recently proposed fit of the 15-year data set obtained from the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) in terms of a relic stochastic…
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…
From the string vacuum to FLRW or de Sitter via corrections
P. Conzinu, G. Fanizza, M. Gasperini +3
We first make more precise a recent "Hamiltonian" reformulation of the Hohm-Zwiebach approach to the tree-level, -invariant string cosmology equations at all orders in the…
A Simple, Exact Formulation of Number Counts in the Geodesic-Light-Cone Gauge
G. Fanizza, M. Gasperini, G. Marozzi
In this article, we compare different formulations of the number count prescription using the convenient formalism of the Geodesic-Light-Cone gauge. We then find a simple, exact, a…
The skewness of the distance-redshift relation in CDM
Tiziano Schiavone, Enea Di Dio, Giuseppe Fanizza
Starting from a recently proposed framework for the evaluation of the cosmological averages, we evaluate the higher-order moments for the distribution of a given observable. Then,…
Dispersive effects in two- and three-dimensional peridynamics
Alessandro Coclite, Giuseppe Maria Coclite, Giuseppe Fanizza +1
In this paper we study the dispersive properties related to a model of peridynamic evolution, governed by a non local initial value problem, in the cases of two and three spatial d…
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…
Comment on "A fractal LTB model cannot explain Dark Energy''
Leonardo Cosmai, Giuseppe Fanizza, Francesco Sylos Labini +2
We reply to the criticisms moved in [1] against our results presented in [2]. In particular, we show that our fractal model has none of the problems claimed in [1]. The latters can…
Bond-based peridynamics, a survey prospecting nonlocal theories of fluid-dynamics
Nunzio Dimola, Alessandro Coclite, Giuseppe Fanizza +1
Peridynamic (PD) theories have gained widespread diffusion among various research areas, due to the ability of modeling discontinuities formation and evolution in materials. Bond-B…
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…
The gauge invariant cosmological Jacobi map from weak lensing at leading order
Giuseppe Fanizza, Enea Di Dio, Ruth Durrer +1
We compute the weak lensing Jacobi map at first order in perturbation theory and show that it is both, gauge invariant and symmetric. Linear perturbations therefore do not induce a…
Precision Cosmology and Hubble tension in the era of LSS surveys
Giuseppe Fanizza
We present a fully relativistic framework to evaluate the impact of stochastic inhomogeneities on the prediction of the Hubble-Lemaître diagram. In this regard, we relate the fluct…
Qualitative aspects in nonlocal dynamics
Giuseppe Maria Coclite, Serena Dipierro, Giuseppe Fanizza +3
In this paper we investigate, through numerical studies, the dynamical evolutions encoded in a linear one-dimensional nonlocal equation arising in peridynamcs. The different propag…
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…
Dispersive effects in a scalar nonlocal wave equation inspired by peridynamics
Giuseppe Maria Coclite, Serena Dipierro, Giuseppe Fanizza +2
We study the dispersive properties of a linear equation in one spatial dimension which is inspired by models in peridynamics. The interplay between nonlocality and dispersion is an…
Cosmic variance of in light of forthcoming high-redshift surveys
Giuseppe Fanizza, Bartolomeo Fiorini, Giovanni Marozzi
Forthcoming surveys will extend the understanding of cosmological large scale structures up to unprecedented redshift. According to this perspective, we present a fully relativisti…
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…