Scuola Superiore Meridionale

Emergence of Gravity's Dynamical and Topological Sectors from Pre-geometry

Andrea Addazi, Giuseppe Meluccio

We identify the complete set of fundamental building blocks for a 4D pre-geometric theory of gravity. Based on a gauge theory of $S O (1, 4)$ or $S O (2, 3)$ coupled to a Higgs-like fiel…

Equivalence Principle violation in metric-affine gravity and finite-temperature effects

Emmanuele Battista, Roberto Campagnola, Salvatore Capozziello +1

Possible violations of the equivalence principle are investigated within the framework of metric-affine gravity and their connection to finite-temperature effects are highlighted.…

Primary Constraints of Newer General Relativity

Carmen Ferrara, Alexey Golovnev, María José Guzmán

We study the primary constraint structure of Newer General Relativity, a gravity theory based on a torsionless teleparallel geometry. The gravitational action is built from a scala…

Friedmann cosmology with fluids and hyperfluids

Ilaria Andrei, Damianos Iosifidis, Laur Järv +1

We discuss flat Friedmann-Lemaitre-Robertson-Walker (FLRW) metric-affine cosmology where the metric and connection as well as the matter energy-momentum and hypermomentum all obey…

Extended Theories of Electrodynamics in $f (R)$ Gravity

Francesco Bajardi, Micol Benetti, Salvatore Capozziello +1

Within the general framework of $f (R)$ gravity, we introduce a function of the electromagnetic curvature invariant $f (F)$ that couples minimally to gravitation to ensure a…

gr-qc2026★ 9 cited

Energy Conditions in Gauss-Bonnet Gravity

Francesco Bajardi

We study the Energy Conditions in modified $f (G)$ gravity, with $G$ being the topological Gauss-Bonnet term. Then we use the cosmographic parameters to constrain the functional for…

gr-qc2026★ 1 cited

Minisuperspace Cosmology in Extended Geometric Trinity of Gravity

Emmanuele Battista, Salvatore Capozziello, Stefano Pastore

We investigate Extended Geometric Trinity of Gravity at both classical and quantum cosmological levels using the minisuperspace approach. Adopting Noether symmetries to select viab…

gr-qc2026★ 4 cited

Constraining $β$ -Exponential Inflation with the latest ACT observations

Jureeporn Yuennan, Farruh Atamurotov, Salvatore Capozziello +1

Recent observations from the Atacama Cosmology Telescope (ACT), especially when combined with DESI baryon acoustic oscillation data, indicate a scalar spectral index $n_{s}$ higher t…

gr-qc2026★ 1 cited

The gravitational energy-momentum pseudo-tensor in $f (Q)$ non-metric gravity

Salvatore Capozziello, Maurizio Capriolo, Gaetano Lambiase

We derive the affine tensor associated with the energy and momentum densities of both gravitational and matter fields, the complex pseudo-tensor, for $f (Q)$ non-metric gravity, the…

gr-qc2026★ 8 cited

Shadow signatures and energy accumulation in Lorentzian-Euclidean black holes

Emmanuele Battista, Salvatore Capozziello, Che-Yu Chen

The Lorentzian-Euclidean black hole has been recently introduced as a geodesically complete spacetime featuring a signature shift at the event horizon where causal geodesics are pr…

gr-qc2026★ 1 cited

Confronting eikonal and post-Kerr methods with numerical evolution of scalar field perturbations in spacetimes beyond Kerr

Ciro De Simone, Sebastian H. Völkel, Kostas D. Kokkotas +2

The accurate computation of quasinormal modes from rotating black holes beyond general relativity is crucial for testing fundamental physics with gravitational waves. In this study…

Primordial black hole dark matter from ultra-slow-roll inflation in Horndeski gravity

Despina Totolou, Theodoros Papanikolaou, Emmanuel N. Saridakis

Primordial black holes (PBHs) provide a well-motivated non-particle candidate for dark matter, requiring an enhancement of curvature perturbations on small inflationary scales cons…

A bigravity model from noncommutative geometry

Marco de Cesare, Mairi Sakellariadou, Araceli Soler Oficial

Noncommutative gravity, based on a twist-deformation of the differential geometry of spacetime and a first-order formulation of the dynamics, requires additional gravitational degr…

Primordial black hole driven cosmic acceleration

Konstantinos Dialektopoulos, Theodoros Papanikolaou, Vasilios Zarikas

We propose a natural mechanism for cosmic acceleration driven by primordial black holes (PBHs) with repulsive behavior, within a ''Swiss Cheese'' cosmological framework. Considerin…

Novel scalar degrees of freedom emerging from hybrid metric-Palatini gravity

David S. Pereira, Salvatore Capozziello, Francisco S. N Lobo +1

Hybrid metric-Palatini gravity unifies the metric and Palatini formalisms while preserving a propagating scalar degree of freedom, offering a compelling route to modified gravity c…

Constraining a de Broglie--Bohm quantum bounce cosmology with Planck data

Micol Benetti, Rudnei O. Ramos, Renato Silva +1

This work investigates a singularity-free early Universe within the paradigm of quantum cosmology. We develop a bouncing model where the singularity is resolved via the de Broglie-…

Is the $Λ$ CDM Model in Crisis?

Himanshu Chaudhary, Salvatore Capozziello, Subhrat Praharaj +2

We present strong evidence for dynamical dark energy that challenges the standard $Λ$ CDM model. Several dark energy scenarios are explored, including $ω_{0} ω_{a}$ CDM, logarithmic, expo…

gr-qc2025★ 3 cited

Constraints on cosmological parameters and CMB first acoustic peak in conformal Killing gravity

Salvatore Capozziello, Carlo Alberto Mantica, Luca Guido Molinari +1

In the frame of conformal Killing gravity cosmology, we performed a Bayesian analysis on two different datasets of Baryon Acoustic oscillations (DESI and SDSS DR16), two datasets o…

Multiple-scale analysis of modified gravitational-wave propagation

Marco de Cesare, Mairi Sakellariadou, Benjamin Sutton

We employ multiple-scale analysis to systematically derive analytical approximations describing the cosmological propagation of gravitational waves beyond general relativity, in a…

gr-qc2025★ 30 cited

Null geodesics, causal structure, and matter accretion in Lorentzian-Euclidean black holes

Salvatore Capozziello, Emmanuele Battista, Silvia De Bianchi

Recently, we introduced the Lorentzian-Euclidean black hole, a static and spherically symmetric solution of vacuum Einstein equations that exhibits a change in metric signature acr…

Generalised Aichelburg-Sexl and Self-Force for photons

Abedennour Dib, Aymeric Garnier, Alessandro Spallicci

We generalise the Aichelburg-Sexl Stress-Energy-Momentum tensor for massless particles to include motion with angular velocity, introducing tensorial spherical harmonics. Further,…

Gravitational wave propagation in bigravity in the late universe

David Brizuela, Marco de Cesare, Araceli Soler Oficial

We carry out a detailed analytical investigation of the propagation of gravitational waves in ghost-free bimetric gravity in a late-time de Sitter epoch. In this regime, the dynami…

gr-qc2025★ 3 cited

Gravitational waves in minimal Maxwell $f (R)$ gravity

Salvatore Capozziello, Qingyu Gan

We discuss the conversion mechanism from scalar field to gravitational waves in magnetic background in $f (R)$ gravity minimal coupled to the Maxwell electrodynamics. Applying the c…