299 citations · 924 across the 41 of their papers we have counts for
20 papers · 1 filter
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.…
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,…
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…
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…
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…
Rotation of the CMB polarisation by foreground lensing
Enea Di Dio, Ruth Durrer, Giuseppe Fanizza +1
We investigate the weak lensing corrections to the CMB polarization anisotropies. We concentrate on the effect of rotation and show that the rotation of polarisation is a true phys…
Observation angles, Fermi coordinates, and the Geodesic-Light-Cone gauge
Giuseppe Fanizza, Maurizio Gasperini, Giovanni Marozzi +1
We show that the angular directions locally measured by a static geodesic observer in a generic cosmological background and expressed in the system of Fermi Normal Coordinates alwa…
Fractal universe and cosmic acceleration in a Lemaître-Tolman-Bondi scenario
Leonardo Cosmai, Giuseppe Fanizza, Francesco Sylos Labini +2
In this paper we attempt to answer to the question: can cosmic acceleration of the Universe have a fractal solution? We give an exact solution of a Lemaître-Tolman-Bondi (LTB) Univ…
Relations between physical observables: what is better?
Giuseppe Fanizza
We investigate some possible relations between physical observables and estimate the "cosmic variance" which affects these measurements. We focus on redshift and angular-distance a…
Impact of next-to-leading order contributions to CMB lensing
Giovanni Marozzi, Giuseppe Fanizza, Enea Di Dio +1
In this Letter we study the impact on cosmological parameter estimation, from present and future surveys, due to lensing corrections on CMB temperature and polarization anisotropie…
CMB-lensing beyond the leading order: temperature and polarization anisotropies
Giovanni Marozzi, Giuseppe Fanizza, Enea Di Dio +1
We investigate the weak lensing corrections to the CMB temperature and polarization anisotropies. We consider all the effects beyond the leading order: post-Born corrections, LSS c…
CMB-lensing beyond the Born approximation
Giovanni Marozzi, Giuseppe Fanizza, Enea Di Dio +1
We investigate the weak lensing corrections to the cosmic microwave background temperature anisotropies considering effects beyond the Born approximation. To this aim, we use the s…
Time of flight of ultra-relativistic particles in a realistic Universe: a viable tool for fundamental physics?
G. Fanizza, M. Gasperini, G. Marozzi +1
Including the metric fluctuations of a realistic cosmological geometry we reconsider an earlier suggestion that measuring the relative time-of-flight of ultra-relativistic particle…
A new approach to the propagation of light-like signals in perturbed cosmological backgrounds
G. Fanizza, M. Gasperini, G. Marozzi +1
We present a new method to compute the deflection of light rays in a perturbed FLRW geometry. We exploit the properties of the Geodesic Light Cone (GLC) gauge where null rays propa…
Electrodynamics in an LTB scenario
G. Fanizza, L. Tedesco
In this article we analyze the electrodynamics in curved space-time in LTB metric. We calculate the most general scale factor in this inhomogeneous Universe. We also study the pres…
An exact Jacobi map in the geodesic light-cone gauge
G. Fanizza, M. Gasperini, G. Marozzi +1
The remarkable properties of the recently proposed geodesic light-cone (GLC) gauge allow to explicitly solve the geodetic-deviation equation, and thus to derive an exact expression…