A5064910431- Cosmology and Gravitation Theories
- Black Holes and Theoretical Physics
- Noncommutative and Quantum Gravity Theories
- Relativity and Gravitational Theory
- Solar and Space Plasma Dynamics
- Magnetic confinement fusion research
- Pulsars and Gravitational Waves Research
- Quantum Mechanics and Applications
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Quantum chaos and dynamical systems
- Galaxies: Formation, Evolution, Phenomena
- Algebraic and Geometric Analysis
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Ionosphere and magnetosphere dynamics
- Advanced Differential Geometry Research
- Particle physics theoretical and experimental studies
- Quantum Electrodynamics and Casimir Effect
- Laser-Plasma Interactions and Diagnostics
- Astrophysics and Cosmic Phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Cold Atom Physics and Bose-Einstein Condensates
- Atomic and Molecular Physics
Reply (Italy)
2025
National Agency for New Technologies, Energy and Sustainable Economic Development
2015-2024
Sapienza University of Rome
2015-2024
National Astronomical Observatory of Japan
2024
The Graduate University for Advanced Studies, SOKENDAI
2024
University of Nevada, Las Vegas
2024
Space Science Institute
2024
Istituto Nazionale di Fisica Nucleare
2000-2023
Tecnologie Avanzate (Italy)
2023
University of Salento
2023
The difference from 4 to 6 σ in the Hubble constant (H0) between values observed with local (Cepheids and Supernovae Ia, SNe Ia) high-z probes (Cosmic Microwave Background obtained by Planck data) still challenges astrophysics cosmology community. Previous analysis has shown that there is an evolution scales as f(z)=H0/(1+z)η, where H0 H0(z=0) η evolutionary parameter. Here, we investigate if this holds using Ia gathered Pantheon sample Baryon Acoustic Oscillations. We assume H0=70kms−1Mpc−1...
It has been shown that in hypertensive patients the degree of target organ damage correlates more closely with average blood pressure as recorded by ambulatory monitoring (ABPM) throughout 24 h than clinic pressure. We examined a group 91 clinically healthy subjects, 23 normotensives and 68 hypertensives according to Cardiac anatomy was investigated echocardiography. As an index arterial structural changes forearm minimal vascular resistance calculated from mean maximal postischemic flow,...
We analyse the $f(R)$ gravity in so-called Jordan frame, as implemented to isotropic Universe dynamics. The goal of present study is show that, according recent data analyses supernovae Ia Pantheon sample, it possible account for an effective redshift dependence Hubble constant. This achieved via dynamics a non-minimally coupled scalar field, emerges gravity. face question both from analytical and purely numerical point view, following same technical paradigm. arrive establish that expected...
We analyze the extension of GUP theory deriving from modified uncertainty principle in agreement with string low energy limit, which represents one most general formulations satisfying Jacobi identity, context associative algebras. After providing some physical insights on nature considered approaches exploiting cosmological arena, first, we show how a natural formulation an infinite momentum space does not lead to emergence nonzero minimal position, then construct truncated space, proving...
ABSTRACT We introduce a theoretical framework to interpret the Hubble tension, based on combination of metric f(R) gravity with dynamical dark energy contribution. The modified provides non-minimally coupled scalar field responsible for proper scaling constant, in order accommodate local SNIa pantheon+ data and Planck measurements. source, which exhibits phantom divide line separating low redshift quintessence regime (−1 < w −1/3) from contribution (w −1) early Universe, guarantees...
We analyze the cosmological implementation of Palatini $f(R)$ theories, constructed with a Nieh-Yan term and solved respect to torsion. consider relevant case quadratic correction Hilbert-Palatini action in Ricci scalar, mimicking Starobinsky model metric formulation. point out emergence peculiar scenarios, depending on sign such correction, able reproduce bouncing settings restore standard Universe dynamics late asymptotic limit. Furthermore, we outline settling Little-Rip dynamics, which...
The Hubble constant ($H_0$) tension between Type Ia Supernovae (SNe Ia) and Planck measurements ranges from 4 to 6 $\sigma$. To investigate this tension, we estimate $H_{0}$ in the $\Lambda$CDM $w_{0}w_{a}$CDM models by dividing Pantheon sample, largest compilation of SNe Ia, into 3, 4, 20 40 bins. We fit extracted values with a function mimicking redshift evolution: $g(z)={H_0}(z)=\tilde{H}_0/(1+z)^\alpha$, where $\alpha$ indicates an evolutionary parameter $\tilde{H}_0=H_0$ at $z=0$. set...
We extend the notion of Nieh-Yan invariant to generic metric-affine geometries, where both torsion and nonmetricity are taken into account. Notably, we show that properties projective invariance topologicity can be independently accommodated by a suitable choice parameters featuring this new term. then consider special class modified theories gravity able promote Immirzi parameter dynamical scalar field coupled form, discuss in more detail dynamics effective tensor theory stemming from such...
The Hubble constant ($H_0$) tension is one of the major open problems in modern cosmology. This discrepancy, ranging from 4 to 6 $\sigma$, between $H_0$ value estimated locally with combination Supernovae Ia (SNe Ia) + Cepheids and cosmological obtained through study Cosmic Microwave Background (CMB) radiation. approaches adopted \cite{2021ApJ...912..150D} \cite{Dainotti2022SNe} are introduced. Through a binning division Pantheon sample SNe \cite{2018ApJ...859..101S}, has been each...
Abstract We study the effects of cut-off physics, in form a modified algebra inspired by Polymer Quantum Mechanics and Generalized Uncertainty Principle representation, on collapse spherical dust cloud. analyze both Newtonian formulation, originally developed Hunter, general relativistic that is Oppenheimer–Snyder model; frameworks we find stabilized to an asymptotically static state above horizon, singularity removed. In case, requiring approximation be valid, lower bounds order unity (in...
This review paper is devoted to analyzing the main properties of cosmological singularity associated with homogeneous and inhomogeneous Mixmaster model. After introduction tools required treat issue, we in detail results obtained over last forty years on topic. We first assess classical picture chaotic cosmologies and, after a presentation canonical method for quantization, develop quantum behavior. Finally, extend both features fully case. Our survey analyzes fundamental framework completes...
We present a review on some of the basic aspects concerning quantum cosmology in presence cut-off physics as it has emerged literature during last fifteen years. first analyze how Wheeler–DeWitt equation describes Universe dynamics, when pure metric approach is concerned, showing how, general, primordial singularity not removed by effects. then main implications applying loop gravity prescriptions to minisuperspace model, i.e., we discuss features so-called cosmology. For isotropic compare...
We compare in some detail Polymer Quantum Mechanics and the Generalized Uncertainty Principle approach to clarify what extent we can treat them on same footing. show that, while a semiclassical level they may be formulated as similar modifications of Poisson algebra, quantum intrinsically differ because PQM implies no absolute minimal uncertainty position. Then implement these schemes Bianchi I cosmology deforming only algebra Universe volume, searching for alternative formulations able...
Starting from a re-analysis of previous work, we construct the proper low energy quantum field theory (QFT) limit full gravity in Born-Oppenheimer approach. We separate gravitational sector into classical background, given by vacuum diagonal Bianchi I cosmology, and its perturbations represented two graviton degrees freedom; further include matter form test scalar field. then implement separation, where gravitons play role "slow" "fast" components respectively, perform...
We consider a dynamic scenario for characterizing the late Universe evolution, aiming to mitigate Hubble tension. Specifically, we metric f(R) gravity in Jordan frame which is implemented dynamics of flat isotropic Universe. This cosmological model incorporates matter creation process, due time variation gravitational field. particle by representing (specifically, given fiducial volume) as an open thermodynamic system. The resulting dynamical involves four unknowns: parameter, non-minimally...
Abstract We analyse a n -dimensional Generalized Uncertainty Principle (GUP) quantization framework, characterized by non-commutative nature of the configurational variables. First, we identify set states which are maximally localized only along single direction, at expense being less in all other ones. Subsequently, order to recover information about localization on whole configuration space, use state theory exhibits maximal simultaneously every direction construct satisfactory...
Modern cosmological research still thoroughly debates the discrepancy between local probes and Cosmic Microwave Background observations in Hubble constant ($H_0$) measurements, ranging from $4\sigma$ to $6\sigma$. In current study we examine this tension using Supernovae Ia (SNe Ia) data \emph{Pantheon}, \emph{PantheonPlus}, \emph{Joint Lightcurve Analysis} (JLA), \emph{Dark Energy Survey} (DES) catalogs together with their combination called \emph{Master Sample} containing 3789 SNe Ia,...