A5054643553- Astro and Planetary Science
- Quantum chaos and dynamical systems
- Geophysics and Gravity Measurements
- Stellar, planetary, and galactic studies
- Solar and Space Plasma Dynamics
- Spacecraft Dynamics and Control
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Nonlinear Waves and Solitons
- Astrophysics and Star Formation Studies
- Experimental and Theoretical Physics Studies
- Space Satellite Systems and Control
- Scientific Research and Discoveries
- Geophysics and Sensor Technology
- Nonlinear Photonic Systems
- Ionosphere and magnetosphere dynamics
- Nuclear physics research studies
- Numerical methods for differential equations
- Geomagnetism and Paleomagnetism Studies
- GNSS positioning and interference
- Planetary Science and Exploration
- Protein Structure and Dynamics
- Advanced Differential Geometry Research
- Nonlinear Dynamics and Pattern Formation
- Gamma-ray bursts and supernovae
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2012-2024
University of Rome Tor Vergata
2015-2024
Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata
2013-2024
University of Milan
2022
Trieste Astronomical Observatory
2020-2021
University of Cagliari
2021
National Institute for Astrophysics
2020
University of Palermo
2020
University of Florence
2010-2018
University of Naples Federico II
2018
In this work, the Laser Ranged Satellites Experiment (LARASE) is presented. This a research program that aims to perform new refined tests and measurements of gravitation in field Earth weak slow motion (WFSM) limit general relativity (GR). For objective we use free available data relative geodetic passive satellite lasers tracked from network ground stations by means laser ranging (SLR) technique. After brief introduction GR its WFSM limit, which contextualize physical background LARASE...
A breakdown of Lorentz Invariance is predicted by some theories as a result quantum physics applied to gravity or for the presence vector/tensor fields, beside metric tensor General Relativity, mediating gravitational interaction. violation would manifest itself, in sector, mainly through non-zero value post-Newtonian parameter $\alpha_1$, that null Relativity. In this paper we describe test Local considering effect possible preferred frame, cosmic microwave background, on orbit LAGEOS II...
Recent results of the LARASE research program in terms model improvements and relativistic measurements are presented. In particular, regarding development new models for non-gravitational perturbations that affect orbit LAGEOS LARES satellites described discussed. These subtle complex effects need a deep knowledge structure physical characteristics order to be correctly accounted for. field gravitational measurements, we present measurement Lense-Thirring precession with 0.5 % precision....
HERMES-TP/SP (High Energy Rapid Modular Ensemble of Satellites Technologic and Scientific Pathfinder) is a constellation six 3U nano-satellites hosting simple but innovative X-ray detectors, characterized by large energy band excellent temporal resolution, thus optimized for the monitoring Cosmic High transients such as Gamma Ray Bursts electromagnetic counterparts Gravitational Wave Events, determination their positions. The projects are funded Italian Ministry University Research Space...
Proper elements are quasi-invariants of a Hamiltonian system, obtained through normalization procedure. have been successfully used to identify families asteroids, sharing the same dynamical properties. We show that proper can also be within space debris dynamics groups fragments associated break-up event. The proposed method allows reconstruct evolutionary history and possibly associate parent body. procedure relies on different steps: (i) development model for an approximate, though...
A torsion pendulum with 2 soft degrees of freedom (DOFs), realized by off-axis cascading two fibers, has been built and operated. This instrument helps characterize the geodesic motion a test mass for LISA Pathfinder or any other free-fall space mission, providing information on cross talk effects that cannot be detected when monitoring single DOF. We show it is possible to simultaneously measure both residual force torque acting quasifree mass. As an example investigations double allows, we...
A new measurement of the gravitomagnetic field Earth is presented. The has been obtained through careful evaluation Lense-Thirring (LT) precession on combined orbits three passive geodetic satellites, LAGEOS, LAGEOS II, and LARES, tracked by Satellite Laser Ranging (SLR) technique. This general relativity precession, also known as frame-dragging, a manifestation spacetime curvature generated mass-currents, peculiarity Einstein’s theory gravitation. stands out, compared to previous...
Using bifurcation theory, we study the secular resonances induced by Sun and Moon on space debris orbits around Earth. In particular, concentrate a special class of resonances, which depend only debris' orbital inclination. This is typically subdivided into three distinct types resonances: those occurring at critical inclination, corresponding to polar orbits, third type resulting from linear combination rates variation argument perigee longitude ascending node. The model describing dynamics...
Two-dimensional Hamiltonian systems admitting second invariants which are quartic in the momenta investigated using Jacobi geometrization of dynamics. This approach allows for a unified treatment at both arbitrary and fixed energy. In differential geometric picture, invariant corresponds to existence fourth rank Killing tensor. Expressing metric terms Kahler potential, integrability condition tensor energy is non-linear equation involving potential. At energy, further conditions must be...
We investigate integrable two-dimensional Hamiltonian systems with scalar and vector potentials, admitting second invariants which are linear or quadratic in the momenta. In case of a invariant, we provide some examples weakly systems. recover classical strongly Cartesian polar coordinates new parabolic elliptical coordinates.
We investigate the dynamics in logarithmic galactic potential with an analytical approach. The phase-space structure of real system is approximated resonant detuned normal forms constructed method based on Lie transform. Attention focused properties axial periodic orbits and low-order "boxlets" that play important role models. Using energy ellipticity as parameters, we find expressions several useful indicators, such stability-instability thresholds, bifurcations, fractions some orbit...
A method able to generalize the static Preisach hysteresis model for dynamic loops under sinusoidal time-varying fields is presented in this paper. The aim obtain an equivalent loops. Then, distribution function parameters are updated according frequency of excitation magnetic field. frequency-dependent have been evaluated by genetic algorithms. Validations based on a comparison results present approach made with different classical numerical modeling