A5046141753- Cosmology and Gravitation Theories
- Geophysics and Sensor Technology
- Pulsars and Gravitational Waves Research
- Relativity and Gravitational Theory
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- Black Holes and Theoretical Physics
- Advanced Frequency and Time Standards
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Experimental and Theoretical Physics Studies
- Geomagnetism and Paleomagnetism Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Mechanical and Optical Resonators
- Earthquake Detection and Analysis
- Quantum and Classical Electrodynamics
- Noncommutative and Quantum Gravity Theories
- Astronomical Observations and Instrumentation
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Algebraic and Geometric Analysis
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Mathematics and Applications
- Astrophysics and Star Formation Studies
University of Turin
2016-2025
Collegio Carlo Alberto
2022-2024
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
2021-2024
Polytechnic University of Turin
2014-2023
University of Iceland
2022-2023
Istituto Nazionale di Fisica Nucleare
2023
Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
2020-2022
University of Insubria
2022
University of Oslo
2022
Turin Polytechnic University
2004-2021
We propose an under-ground experiment to detect the general relativistic effects due curvature of space-time around Earth (de Sitter effect) and rotation planet (dragging inertial frames or Lense-Thirring effect). It is based on comparison between IERS value vector corresponding measurements obtained by a tri-axial laser detector rotation. The proposed consists six large ring-lasers arranged along three orthogonal axes. In about two years data taking, 1% sensitivity required for measurement...
We study weak-field solutions having spherical symmetry in $f(T)$ gravity; to this end, we solve the field equations for a non diagonal tetrad, starting from Lagrangian form $f(T)=T+\alpha T^{n}$, where $\alpha$ is small constant, parameterizing departure of theory GR. show that classical spherically symmetric GR, i.e. Schwarzschild and Schwarzschild-de Sitter solutions, are perturbed by terms $\propto r^{2-2n}$ discuss impact these perturbations observational tests.
We investigate the four solar system tests of gravity - perihelion precession, light bending, Shapiro time delay, gravitational redshift in $f(T)$ gravity. In particular, we solution derived by Ruggiero and Radicella, Phys. Rev. D 91, 104014 (2015), for a nondiagonal vierbein field polynomial $f(T) = T + \alpha T^n$, where $\alpha$ is constant $|n| \neq 1$. this paper, derive solutions each test, which Weinberg's, Bodenner Will's, Cattani et al. Rindler Ishak's methods are applied,...
In the framework of f(T) theories gravity, we solve field equations for f(T)=T+α Tn in weak-field approximation and spherical symmetry spacetime. Since f(T)=T corresponds to Teleparallel Gravity, which is equivalent General Relativity, non linearity Lagrangian are expected produce perturbations general relativistic solutions, parameterized by α. Hence, use solutions model gravitational Sun exploit data from accurate radio-tracking spacecrafts orbiting Mercury Saturn infer preliminary bounds...
This paper contains a review of the theory and practice gravitomagnetism, with particular attention to different numerous proposals which have been put forward experimentally or observationally verify its effects. The basics gravitoelectromagnetic form Einstein equations is expounded. Then Lense-Thirring clock effects are described, reviewing essentials theory. Space based Earth experiments listed. Other effects, such as coupling gravitomagnetism spin, described orders magnitude considered...
We study disk galaxies in the framework of general relativity to focus on possibility that, even low energy limit, there are relevant corrections with respect purely Newtonian approach. Our analysis encompasses model by considering both a expansion and exact solutions, making clear connection between these different approaches. In particular, we two limits: well-known gravitomagnetic analogy new called ``strong gravitomagnetism,'' which has $c$ same order as terms. show that limits class...
Abstract In-service teacher training must ensure professional development based on both disciplinary and pedagogical research, taking advantage of collaboration between different institutional agencies. In this article we will talk about a collaborative experience among partners, to increase teachers’ interest in new tools learning environments. We use kinds sessions introduce innovative didactic methodologies for teaching involving university research staff secondary school teachers. The...
Abstract We study the interaction between a plane gravitational wave and electromagnetic fields, analyzing this in proper detector frame. The field is treated as an effective medium, within framework, we demonstrate that coupling pre-existing fields generates new currents. This approach, alternative to previously explored methods, has advantage of employing Fermi coordinates, which enable direct reference measurable quantities. To assess impact effect waves, solve Maxwell’s equations for...
In this paper we study the effects of f(R) theories gravity on Solar System gravitational tests. particular, starting from an exact solution field equation in vacuum, Palatini formalism, work out that modifications to Newtonian potential would induce Keplerian orbital elements planets, and compare them with latest results planetary orbit determination EPM2004 ephemerides. It turns longitudes perihelia mean are affected by secular precessions. We obtain resulting best estimate parameter k...
We focus on Horava-Lifshitz (HL) theory of gravity, and, in particular, the Kehagias and Sfetsos s solution that is analog Schwarzschild black hole General Relativity. In weak-field slow-motion approximation we analytically work out secular precession longitude pericentre a test particle induced by this solution. Its analytical form different from general relativistic Einstein's precession. Then, compare it to latest determinations corrections standard Newtonian/ Einsteinian planetary...
The Sagnac effect is usually deemed to be a special-relativistic produced in an interferometer when the device rotating. Two light beams traveling around opposite directions require different times of flight complete their closed path, giving rise phase shift proportional angular velocity apparatus. Here, we show that same result can obtained absence rotation, there relative motion (be it inertial or not) between source/receiver and interferometer. Our argument will use both simple algebraic...
We discuss the linear gravitoelectromagnetic approach used to solve Einstein equations in weak-field and slow-motion approximation, which is a powerful tool explain, by analogy with electromagnetism, several gravitational effects Solar System, where approximation holds true. In particular, we according can be written as Maxwell-like focus on definition of fields non stationary conditions. Furthermore, examine what extent, starting from given solution equations, describe motion test particles...
It is a well known fact that, in the absence of Dark Matter, observation rotation curves galaxies cannot be explained terms Newtonian gravity. Rotation become flat outer regions, contrast to what expected according Keplerian motion. Far from galactic center, gravitational field supposed weak enough so we expect able use Gravity; however, even weak-field approximation, there are general relativistic effects without counterpart, such as gravitomagnetic originating mass currents. Using...
We use the gravitoelectromagnetic approach to solutions of Einstein's equations in weak-field and slow-motion approximation investigate impact general relativity on galactic dynamics. In particular, we focus a particular class for gravitomagnetic field, show that, contrary what is expected, they may introduce non-negligible corrections Newtonian velocity profile. The origin interpretation these are discussed explicit applications some models provided. These homogeneous i.e., with vanishing...
Abstract We study an exact solution of Einstein's equations describing a self-gravitating system, made dust, distributed with axial symmetry and in stationary rotation, we prove that this type system has no Newtonian analogue. In low-energy limit, its existence depends on the Grad-Shafranov equation vacuum which can be interpreted as Laplace for toroidal component gravitomagnetic potential; particular, relativistic rotational effects are order magnitude ones. therefore argue should contain...