A5001493622- Relativity and Gravitational Theory
- Geophysics and Sensor Technology
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Geophysics and Gravity Measurements
- Advanced Frequency and Time Standards
- Black Holes and Theoretical Physics
- Experimental and Theoretical Physics Studies
- Solar and Space Plasma Dynamics
- Experimental Learning in Engineering
- Quantum Mechanics and Applications
- Noncommutative and Quantum Gravity Theories
- High-pressure geophysics and materials
- Advanced Thermodynamics and Statistical Mechanics
- Geomagnetism and Paleomagnetism Studies
- History and Developments in Astronomy
- Stellar, planetary, and galactic studies
- Atomic and Subatomic Physics Research
- Astronomical Observations and Instrumentation
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum, superfluid, helium dynamics
- Complex Systems and Time Series Analysis
- Educational and Social Studies
- Advanced Differential Geometry Research
- Gamma-ray bursts and supernovae
National Institute for Astrophysics
2021-2023
Polytechnic University of Turin
2013-2022
Osservatorio Astrofisico di Torino
2020
Karlsruhe Institute of Technology
2020
Istituto Nazionale di Fisica Nucleare, Sezione di Napoli
2020
Istituto Nazionale di Alta Matematica Francesco Severi
2017-2018
Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2005-2017
Torino e-district
2017
Aix-Marseille Université
2016
Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
2015
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 discuss the transition from quasi-circular inspiral to plunge of a system two nonrotating black holes masses m 1 and 2 in extreme mass ratio limit ≪ (m +m ) .In spirit Effective One Body (EOB) approach general relativistic dynamics binary systems, hole is represented terms an effective particle µ ≡ /(m + moving (quasi-)Schwarzschild background M submitted O(µ) radiation reaction force defined by Padé resumming high-order Post-Newtonian results.We then complete this numerically computing,...
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...
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...
The Einstein–Cartan theory of gravitation and the classical defects in an elastic medium are presented compared. former is extension general relativity refers to four-dimensional space–time, while we introduce latter as a description equilibrium state three-dimensional continuum. Despite these important differences, analogy built on their common geometrical foundations, it shown that space–time with curvature torsion can be considered continuum containing defects. This formal useful for...
The difference in travel time of corotating and counterrotating light waves the field a central massive spinning body is studied. corrections to special relativistic formula are worked out Kerr field. An estimation numeric values for Earth satellites orbit around it show that direct measurement on order concrete possibilities.
The essence of the gravitomagnetic clock effect is properly defined showing that its origin in topology world lines with closed space projections. It shown that, weak field approximation and for a spherically symmetric central body, loss synchrony between two clocks counter-rotating along circular geodesic proportional to angular momentum source gravitational field. Numerical estimates are presented objects within solar system. less unfavorable situation found around Jupiter.
A Web-based automatic evaluation system for students of engineering faculties is described. The system, named Test on Line (ToL), can verify the possession ideas, ability to combine them into deductions, and capability make simple numerical calculations otherwise practical exercises. ToL has been extensively in use basic physics courses at Turin Politecnico since beginning 1999. Consequently, accumulated statistical data amount approximately four thousand individual tests show credibility...
A 4-dimensional relativistic positioning system for a general spacetime is constructed by using the so called "emission coordinates."The results apply in small region around world line of an accelerated observer carrying Fermi triad, as described metric.In case Schwarzschild modeling gravitational field Earth and at rest fixed point, these coordinates realize alternative to current GPS system.The latter indeed essentially conceived Newtonian, that it necessarily needs taking into account...
Large scale square ring laser gyros with a length of four meters on each side are approaching sensitivity 1x10^-11 rad/s/sqrt(Hz). This is about the regime required to measure gravitomagnetic effect (Lense Thirring) Earth. For an ensemble linearly independent measurement signal depends upon orientation single axis gyro respect rotational Therefore at least 3 necessary reconstruct complete angular apparatus. In general, setup consists several gyroscopes (we would prefer more than for...
Recently proposed theories based on the cosmic presence of a vectorial field are compared and contrasted. In particular so-called Einstein \ae{}ther theory is discussed in parallel with recent proposal strained space-time (cosmic defect theory). We show that latter fits reasonably well observed data only one, or at most two, adjustable parameters, while other vector use much more. The Newtonian limits also compared. Finally we may be considered as special case theories, corresponding to more...
The case of the quantum unidimensional motion a point particle subject to viscous force proportional square speed is treated. Once suitable Lagrangian has been chosen, canonical quantization procedure applied leading Schr\"odinger equation for quadratic friction and an arbitrary potential. cases exponentially decreasing potential plus linearly increasing term explicitly solved.
The classical theory of strain in material continua is reviewed and generalized to space-time. Strain attributed "external" (matter/energy fields) intrinsic sources fixing the global symmetry universe (defects continuum). A Lagrangian for space-time worked out, adding usual Hilbert term an "elastic" contribution from strain. This approach equivalent a peculiar tensor field, which indeed part metric tensor. gives configuration accounting both initial inflation late acceleration. Considering...