126 citations · 296 across the 12 of their papers we have counts for
13 papers
Cosmological consequences of scale-dependent Barrow-Tsallis entropy
Giuseppe Gaetano Luciano, Orlando Luongo, Marco Muccino
We investigate an extended cosmological scenario based on the Barrow-Tsallis entropy, incorporating a varying (i.e., energy-scale-dependent) anomalous dimension. This behavior is r…
Investigating the cosmic distance duality relation with gamma-ray bursts
Anna Chiara Alfano, Carlo Cafaro, Salvatore Capozziello +2
Deviations from the so-called {\it cosmic distance duality relation} may result from systematic errors in distance measurements or, more interestingly, hint at new physics. Further…
Gravitational metamaterials from optical properties of spacetime media
Orlando Luongo
Gravitational optical properties are here investigated under the hypothesis of spherically-symmetric spacetimes behaving as media. To do so, we first consider two different definit…
Cosmic distance duality after DESI 2024 data release and dark energy evolution
Anna Chiara Alfano, Orlando Luongo
The cosmic distance duality relates the angular-diameter and luminosity distances and its possible violation may puzzle the standard cosmological model. This appears particularly i…
Production of ultralight dark matter from inflationary spectator fields
Alessio Belfiglio, Orlando Luongo
We investigate inflationary particle production associated with a spectator ultralight scalar field, which has been recently proposed as a plausible dark matter candidate. In this…
Superhorizon entanglement from inflationary particle production
Alessio Belfiglio, Orlando Luongo, Stefano Mancini
We investigate entanglement generation between the sub- and super-Hubble modes of inflaton fluctuations, in the context of particle production from perturbations during inflation.…
De Sitter-like configurations with asymptotic quintessence environment
Roberto Giambò, Orlando Luongo
We examine a spherically-symmetric class of spacetimes carrying vacuum energy, while considering the influence of an external dark energy environment represented by a non-dynamical…
Repulsive gravity in regular black holes
Orlando Luongo, Hernando Quevedo
We evaluate the effects of repulsive gravity using first order geometric invariants, \textit{i.e.}, the Ricci scalar and the eigenvalues of the Riemann curvature tensor, for three…
Red and blue shift in spherical and axisymmetric spacetimes and astrophysical constraints
Roberto Giambò, Orlando Luongo, Lorenza Mauro
We compute the red and blue shifts for astrophysical and cosmological sources. In particular, we consider low, intermediate and high gravitational energy domains. Thereby, we handl…
Model independent calibrations of gamma ray bursts using machine learning
Orlando Luongo, Marco Muccino
We alleviate the circularity problem, whereby gamma-ray bursts are not perfect distance indicators, by means of a new model-independent technique based on Bézier polynomials. To do…
Kinematic constraints beyond using calibrated GRB correlations
Orlando Luongo, Marco Muccino
The dynamics of the Universe are revised using high-redshift data from gamma-ray bursts to constrain cosmographic parameters by means of model-independent techniques. Considering s…
Entanglement in model independent cosmological scenario
Orlando Luongo, Stefano Mancini
We propose a \emph{model-independent} approach to study entanglement creation due to the dynamics between two asymptotic quantum regimes in the framework of homogeneous and isotrop…
Addressing the circularity problem in the correlation of Gamma-Ray Bursts
Lorenzo Amati, Rocco D'Agostino, Orlando Luongo +2
We here propose a new model-independent technique to overcome the circularity problem affecting the use of Gamma-Ray Bursts (GRBs) as distance indicators through the use of $E_{\rm…