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Constraints on the Pre-Big Bang scenario from a cosmological interpretation of the NANOGrav data / Conzinu, P. (INFN, Parma ; U. Parma (main)) ; Fanizza, G. (U. Lisbon (main)) ; Gasperini, M. (INFN, Bari ; U. Bari (main)) ; Pavone, E. (INFN, Bari ; U. Bari (main)) ; Tedesco, L. (INFN, Bari ; U. Bari (main)) ; Veneziano, G. (CERN ; College de France)
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 background of primordial gravitons, produced in the context of the string cosmology pre-big bang scenario. [...]
arXiv:2412.01734 ; CERN-TH-2024-210 ; BA-TH/809-24. - 19.
Fulltext

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From the string vacuum to FLRW or de Sitter via $\alpha'$ corrections / Conzinu, P. (Pisa U. ; INFN, Pisa) ; Fanizza, G. (Lisbon U.) ; Gasperini, M. (Bari U. ; INFN, Bari) ; Pavone, E. (Bari U. ; INFN, Bari) ; Tedesco, L. (Bari U. ; INFN, Bari) ; Veneziano, G. (CERN ; College de France)
We first make more precise a recent "Hamiltonian" reformulation of the Hohm-Zwiebach approach to the tree-level, $O(d,d)$-invariant string cosmology equations at all orders in the $\alpha'$ expansion, and recall how it allows to give a simple characterization of a large class of cosmological scenarios connecting, through a non-singular bounce, two duality-related perturbative solutions at early and late times. We then discuss the effects of adding to the action a non-perturbative, $O(d,d)$-breaking, dilaton potential $V(\phi)$. [...]
arXiv:2308.16076; BA-TH/808-23; CERN-TH-2023-163.- 2023-12-12 - 30 p. - Published in : JCAP 2312 (2023) 019 Fulltext: 2308.16076 - PDF; document - PDF;

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The skewness of the distance-redshift relation in $\Lambda$CDM / Schiavone, T. (Lisbon U. ; INFN, Pisa ; Pisa U.) ; Di Dio, E. (CERN) ; Fanizza, G. (Lisbon U.)
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, we explicitly discuss the case of the Hubble-Lemaître diagram and evaluate its skewness at the leading order in the cosmological perturbative expansion of the gravitational potential. [...]
arXiv:2307.13455; CERN-TH-2023-141.- 2024-02-26 - 32 p. - Published in : JCAP 2402 (2024) 050 Fulltext: document - PDF; 2307.13455 - PDF;

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Newsletter Task Force / Fanizza, Giuseppe (speaker) (IA - Lisbon)
2023 - 256. Eucapt Conferences; Third EuCAPT Annual Symposium External links: Talk details; Event details In : Third EuCAPT Annual Symposium

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The gauge invariant cosmological Jacobi map from weak lensing at leading order / Fanizza, Giuseppe (Lisbon U. ; CERN) ; Di Dio, Enea (CERN) ; Durrer, Ruth (Geneva U., CAP ; Geneva U., Dept. Theor. Phys.) ; Marozzi, Giovanni (INFN, Pisa ; Pisa U.)
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 any rotation. [...]
arXiv:2201.11552; CERN-TH-2022-008.- 2022-08-25 - 38 p. - Published in : JCAP 2208 (2022) 052 Fulltext: Publication - PDF; 2201.11552 - PDF;

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Precision Cosmology and Hubble tension in the era of LSS surveys / Fanizza, Giuseppe
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 fluctuations of the luminosity distance-redshift relation in the Cosmic Concordance model to the intrinsic uncertainty associated to the estimation of cosmological parameters from high-redshift surveys (up to z = 4). [...]
arXiv:2110.15272; CERN-TH-2021-173.- 2023 - 11 p. - Published in : 10.1142/9789811269776_0140 Fulltext: 2110.15272 - PDF; document - PDF;
In : 16th Marcel Grossmann Meeting on Recent Developments in Theoretical and Experimental General Relativity, Astrophysics and Relativistic Field Theories, Online, 5 - 9 Jul 2021, pp.1792-1802

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Generalized covariant prescriptions for averaging cosmological observables / Fanizza, Giuseppe (INFN, Pisa ; U. Lisbon (main)) ; Gasperini, Maurizio (Bari U. ; INFN, Bari) ; Marozzi, Giovanni (Pisa U. ; INFN, Pisa) ; Veneziano, Gabriele (CERN ; College de France)
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 given observer. One of these prescriptions is adapted to sources exactly located on a given space-like hypersurface, the other applies instead to situations where the physical location of the sources is characterized by the experimental "spread" of a given observational variable. [...]
arXiv:1911.09469; BA-TH/721-19; CERN-TH-2019-183.- 2020-02-14 - 29 p. - Published in : JCAP 2002 (2020) 017 Fulltext: PDF;

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Observation angles, Fermi coordinates, and the Geodesic-Light-Cone gauge / Fanizza, Giuseppe (INFN, Pisa ; Zurich U.) ; Gasperini, Maurizio (Bari U. ; INFN, Bari) ; Marozzi, Giovanni (Pisa U. ; INFN, Pisa) ; Veneziano, Gabriele (CERN ; College de France)
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 always coincide with those expressed in the Geodesic-Light-Cone (GLC) gauge, up to a local transformation which exploits the residual gauge freedom of the GLC coordinates. This is not the case for other gauges - like, for instance, the synchronous and longitudinal gauge - commonly used in the context of observational cosmology. [...]
arXiv:1812.03671; BA-TH/716-18; CERN-TH-2018-253.- 2019-01-03 - 14 p. - Published in : JCAP 1901 (2019) 004 Fulltext: PDF;

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Time of flight of ultra-relativistic particles in a realistic Universe: a viable tool for fundamental physics? / Fanizza, G. (Geneva U., CAP ; Bari U. ; Geneva U., Dept. Theor. Phys. ; INFN, Bari) ; Gasperini, M. (Bari U. ; INFN, Bari) ; Marozzi, G. (Rio de Janeiro, CBPF ; Geneva U., CAP ; Geneva U., Dept. Theor. Phys.) ; Veneziano, G. (College de France ; CERN ; Rome U.)
Including the metric fluctuations of a realistic cosmological geometry we reconsider an earlier suggestion that measuring the relative time-of-flight of ultra-relativistic particles can provide interesting constraints on fundamental cosmological and/or particle parameters. Using convenient properties of the geodetic light-cone gauge we first compute, to leading order in the Lorentz factor and for a generic (inhomogeneous, anisotropic) space-time, the relative arrival times of two ultra-relativistic particles as a function of their masses and energies as well as of the details of the large-scale geometry. [...]
arXiv:1512.08489; CERN-PH-TH-2015-306; CERN-PH-TH-2015-306.- 2016-06-10 - 5 p. - Published in : Phys. Lett. B 757 (2016) 505-509 Article from SCOAP3: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; External link: Preprint

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10.

A new approach to the propagation of light-like signals in perturbed cosmological backgrounds / Fanizza, G. (Bari U. ; Geneva U., Dept. Theor. Phys. ; Geneva U., CAP) ; Gasperini, M. (Bari U.) ; Marozzi, G. (Geneva U., Dept. Theor. Phys. ; Geneva U., CAP) ; Veneziano, G. (College de France ; CERN)
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 propagate at constant angular coordinates irrespectively of the given (inhomogeneous and/or anisotropic) geometry. [...]
arXiv:1506.02003; CERN-PH-TH-2015-132; CERN-PH-TH-2015-132.- Geneva : CERN, 2015-08-11 - 36 p. - Published in : JCAP 08 (2015) 020 Fulltext: PDF; External link: Preprint

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See also: similar author names
8	Fanizza, G
12	Fanizza, Giuseppe

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