2.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Sapienza University of RomeIT497 papers
- National Institute for AstrophysicsIT152 papers
- Astronomical Observatory of CapodimonteIT83 papers
- Centro Brasileiro de Pesquisas FísicasBR81 papers
- University of FerraraIT75 papers
- Astronomical Observatory of RomeIT65 papers
- Institute for Space Astrophysics and PlanetologyIT64 papers
- European Southern ObservatoryCL62 papers
- International Center for Relativistic Astrophysics NetworkAM60 papers
- Brera Astronomical ObservatoryIT58 papers
- Osservatorio Astronomico di PadovaIT57 papers
- Centre National de la Recherche ScientifiqueFR52 papers
22 papers · 1 filter
On the Quantum Origin of the Mixmaster Chaos Covariance
Giovanni Paolo Imponente, Giovanni Montani
Our analysis shows how the covariant chaotic behavior characterizing the evolution of the Mixmaster cosmology near the initial singularity can be taken as the semiclassical limit i…
Circular Holonomy and Clock Effects in Stationary Axisymmetric Spacetimes
Donato Bini, Robert T. Jantzen, Bahram Mashhoon
Stationary axisymmetric spacetimes containing a pair of oppositely-rotating periodically-intersecting circular geodesics allow the study of various so-called `clock effects' by com…
The Cotton, Simon-Mars and Cotton-York Tensors in Stationary Spacetimes
Donato Bini, Robert T Jantzen, Giovanni Miniutti
The Cotton-York and Simon-Mars tensors in stationary vacuum spacetimes are studied in the language of the congruence approach pioneered by Hawking and Ellis. Their relationships wi…
The pulse phase-dependent spectrum of the anomalous X-ray pulsar 1RXS J170849-400910
G. L. Israel, T. Oosterbroek, L. Stella +3
We report on the results of a 50ks BeppoSAX observation of 1RXS J170849-400910, one of the five (plus a candidate) known anomalous X-ray pulsars. The BeppoSAX data are consistent w…
On the interpretation of the burst structure of GRBs
R. Ruffini, C. L. Bianco, P. Chardonnet +2
Given the very accurate data from the BATSE experiment and RXTE and Chandra satellites, we use the GRB 991216 as a prototypical case to test the EMBH theory linking the origin of t…
The transient X-ray pulsar 4U 0115+63 from quiescence to outburst through the centrifugal transition
S. Campana, F. Gastaldello, L. Stella +5
We report on a BeppoSAX observation of the transient X-ray pulsar 4U 0115+63 close to periastron. This led to the discovery of a dramatic luminosity variation from ~2x10^34 erg/s t…
On a possible GRB-supernova time sequence
R. Ruffini, C. L. Bianco, P. Chardonnet +2
The data from the Chandra satellite on the iron emission lines in the afterglow of GRB 991216 are used to give further support for the EMBH theory, which links the origin of the en…
Relative space-time transformations in GRBs
R. Ruffini, C. L. Bianco, P. Chardonnet +2
The GRB 991216 and its relevant data acquired from the BATSE experiment and RXTE and Chandra satellites are used as a prototypical case to test the theory linking the origin of gam…
The Many Faces of Gravitoelectromagnetism
Robert T. Jantzen, Paolo Carini, Donato Bini
The numerous ways of introducing spatial gravitational forces are fit together in a single framework enabling their interrelationships to be clarified. This framework is then used…
Covariant Formulation of the Invariant Measure for the Mixmaster Dynamics
Giovanni Imponente, Giovanni Montani
We provide a Hamiltonian analysis of the Mixmaster Universe dynamics showing the covariant nature of its chaotic behavior with respect to any choice of time variable. We construct…
The intrinsic derivative and centrifugal forces in general relativity: II. Applications to circular orbits in some familiar stationary axisymmetric spacetimes
Donato Bini, Paolo Carini, Robert T Jantzen
The tools developed in a preceding article for interpreting spacetime geometry in terms of all possible space-plus-time splitting approaches are applied to circular orbits in some…
The intrinsic derivative and centrifugal forces in general relativity: I. Theoretical foundations
Donato Bini, Paolo Carini, Robert T Jantzen
Everyday experience with centrifugal forces has always guided thinking on the close relationship between gravitational forces and accelerated systems of reference. Once spatial gra…
Analogies, new paradigms and observational data as growing factors of Relativistic Astrophysics
Remo J. Ruffini
Patterns in the scientific developments of Relativistic Astrophysics are analyzed with special attention to the physics and astrophysics of Black Holes and Gamma Ray Bursts.
On the clustering phase transition in self-gravitating N-body systems
Monica Cerruti-Sola, Piero Cipriani, Marco Pettini
The thermodynamic behaviour of self-gravitating -body systems has been worked out by borrowing a standard method from Molecular Dynamics: the time averages of suitable quantitie…
Relativistic Thomas-Fermi Model at Finite Temperatures
G. Bertone, R. Ruffini
We briefly review the Thomas-Fermi statistical model of atoms in the classical non-relativistic formulation and in the generalised finite-nucleus relativistic formulation. We then…
Detection of a Hard Tail in the X-ray Spectrum of the Z Source GX 349+2
T. Di Salvo, N. R. Robba, R. Iaria +3
We present the results of a BeppoSAX observation of the Z source GX 349+2 covering the energy range 0.1-200 keV. The presence of flares in the light curve indicates that the source…
Strong Chaos in the N-body problem and Microcanonical Thermodynamics of collisionless self gravitating systems
Piero Cipriani, Marco Pettini
The dynamical justifications which lie at the basis of an effective Statistical Mechanics for self gravitating systems are formulated, analyzing some among the well known obstacles…
On the Covariance of the Mixmaster Chaoticity
G. P. Imponente, G. Montani
We analyze the dynamics of the Mixmaster Universe on the base of a standard Arnowitt-Deser-Misner Hamiltonian approach showing how its asymptotic evolution to the cosmological sing…
The elementary spike produced by a pure pair-electromagnetic pulse from a Black Hole: The PEM Pulse
Carlo Luciano Bianco, Remo Ruffini, She-Sheng Xue
In the framework of the model that uses black holes endowed with electromagnetic structure (EMBH) as the energy source, we study how an elementary spike appears to the detectors. W…
Influence of the Particles Creation on the Flat and Negative Curved FLRW Universes
G. Montani
We present a dynamical analysis of the (classical) spatially flat and negative curved Friedmann-Lameitre-Robertson-Walker (FLRW) universes evolving, (by assumption) close to the th…
Gravitomagnetism and Relative Observer Clock Effects
Donato Bini, Robert T. Jantzen, Bahram Mashhoon
The gravitomagnetic clock effect and the Sagnac effect for circularly rotating orbits in stationary axisymmetric spacetimes are studied from a relative observer point of view, clar…
Damping time and stability of density fermion perturbations in the expanding universe
Costantino Sigismondi, Simonetta Filippi, Luis Alberto Sanchez +1
The classic problem of the growth of density perturbations in an expanding Newtonian universe is revisited following the work of Bisnovatyi-Kogan and Zel'dovich. We propose a more…