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
44 papers · 1 filter
Gravitational energy as dark energy: Average observational quantities
David L. Wiltshire
In the timescape scenario cosmic acceleration is understand as an apparent effect, due to gravitational energy gradients that grow when spatial curvature gradients become significa…
From time to timescape - Einstein's unfinished revolution
David L. Wiltshire
I argue that Einstein overlooked an important aspect of the relativity of time in never quite realizing his quest to embody Mach's principle in his theory of gravity. As a step tow…
Gravitational Instability in Presence of Bulk Viscosity: the Jeans Mass and the Quasi-Isotropic Solution
Nakia Carlevaro, Giovanni Montani
This paper focuses on the analysis of the gravitational instability in presence of bulk viscosity both in Newtonian regime and in the fully-relativistic approach. The standard Jean…
Detailed discussions and calculations of quantum Regge calculus of Einstein-Cartan theory
She-Sheng Xue
This article presents detailed discussions and calculations of the recent paper "Quantum Regge calculus of Einstein-Cartan theory" in Phys. Lett. B682 (2009) 300. The Euclidean spa…
Massive test particles motion in Kaluza-Klein gravity
Valentino Lacquaniti, Giovanni Montani, Daniela Pugliese
A class of static, vacuum solutions of (free-electromagnetic) Kaluza-Klein equations with three-dimensional spherical symmetry is studied. In order to explore the dynamic in such s…
Effective One Body description of tidal effects in inspiralling compact binaries
Thibault Damour, Alessandro Nagar
The late part of the gravitational wave signal of binary neutron star inspirals can in principle yield crucial information on the nuclear equation of state via its dependence on re…
Moments with Yakov Borisovich Zeldovich
Remo Ruffini
A recollection of special moments spent with Yakov Borisovich Zeldovich and with the scientists of Soviet Union and abroad.
Electron-positron pairs in physics and astrophysics: from heavy nuclei to black holes
Remo Ruffini, Gregory Vereshchagin, She-Sheng Xue
From the interaction of physics and astrophysics we are witnessing in these years a splendid synthesis of theoretical, experimental and observational results originating from three…
On the relativistic Thomas-Fermi treatment of compressed atoms and compressed nuclear matter cores of stellar dimensions
M. Rotondo, Jorge A. Rueda, R. Ruffini +1
The Feynman, Metropolis and Teller treatment of compressed atoms is extended to the relativistic regimes. Each atomic configuration is confined by a Wigner-Seitz cell and is charac…
Discovery of photon index saturation in the black hole binary GRS 1915+105
Lev Titarchuk, Elena Seifina
We present a study of the correlations between spectral, timing properties and mass accretion rate observed in X-rays from the Galactic Black Hole (BH) binary GRS 1915+105 during t…
Dixon's extended bodies and impulsive gravitational waves
Donato Bini, Pierluigi Fortini, Andrea Geralico +1
The "reaction" of an extended body to the passage of an exact plane gravitational wave is discussed following Dixon's model. The analysis performed shows several general features,…
Extending the Hubble diagram by gamma ray bursts
L. Izzo, S. Capozziello, G. Covone +1
A new method to constrain the cosmological equation of state is proposed by using combined samples of gamma-ray bursts (GRBs) and supernovae (SNeIa). The Chevallier-Polarski-Linder…
Cosmological singularity
V. Belinski
The talk at international conference in honor of Ya. B. Zeldovich 95th Anniversary, Minsk, Belarus, April 2009. The talk represents a review of the old results and contemporary dev…
On Tunnelling Through the Black Hole Horizon
V. A. Belinski
It is shown here that there is no way for particle creation to occur by quantum tunneling through an infinitesimal neighborhood of the black hole horizon. This result is a trivial…
VLBA Observations of Sub-Parsec Structure in Mrk 231: Interaction between a Relativistic Jet and a BAL Wind
Cormac Reynolds, Brian Punsly, Preeti Kharb +2
We report on the first high frequency VLBI observations of the nearby broad absorption line quasar (BALQSO), Mrk 231. Three epochs of observations were achieved at 15 GHz and 22 GH…
Prompt Ia Supernovae Are Significantly Delayed
Cody Raskin, Evan Scannapieco, James Rhoads +1
The time delay between the formation of a population of stars and the onset of type Ia supernovae (SNe Ia) sets important limits on the masses and nature of SN Ia progenitors. Here…
Dimensional Reduction of the 5D Kaluza-Klein Geodesic Deviation Equation
V. Lacquaniti, G. Montani, F. Vietri
In the work of Kerner et al. (2001) the problem of the geodesic deviation in a 5D Kaluza Klein background is faced. The 4D space-time projection of the resulting equation coincides…
Linear Two-Dimensional MHD of Accretion Disks: Crystalline structure and Nernst coefficient
Giovanni Montani, Riccardo Benini
We analyse the two-dimensional MHD configurations characterising the steady state of the accretion disk on a highly magnetised neutron star. The model we describe has a local chara…
Three Dimensional Simulations of Vertical Magnetic Flux in the Immediate Vicinity of Black Holes
Brian Punsly, Igor V. Igumenshchev, Shigenobu Hirose
This article reports on three-dimensional (3-D) MHD simulations of non-rotating and rapidly rotating black holes and the adjacent black hole accretion disk magnetospheres. A partic…
No Evidence for Dark Energy Dynamics from a Global Analysis of Cosmological Data
Paolo Serra, Asantha Cooray, Daniel E. Holz +3
We use a variant of principal component analysis to investigate the possible temporal evolution of the dark energy equation of state, w(z). We constrain w(z) in multiple redshift b…
Primordial magnetic fields and gravitational baryogenesis in nonlinear electrodynamics
Herman J. Mosquera Cuesta, Gaetano Lambiase
The amplification of the primordial magnetic fields and the gravitational baryogenesis, a mechanism that allows to generate the baryon asymmetry in the Universe by means of the cou…
The Jeans Instability in Presence of Viscous Effects
Nakia Carlevaro, Giovanni Montani
An analysis of the gravitational instability in presence of dissipative effects is addressed. In particular, the standard Jeans Mechanism and the generalization in treating the Uni…
The Immirzi parameter from an external scalar field
Francesco Cianfrani, Giovanni Montani
We promote the Immirzi parameter to be a minimally coupled scalar field and we analyzed the Hamiltonian constraints in the framework of Loop Quantum Gravity without the time gauge.…
Cosmography by GRBs : Gamma Ray Bursts as possible distance indicators
S. Capozziello, L. Izzo
A new method to constrain the cosmological equation of state is proposed by using combined samples of gamma-ray bursts (GRBs) and supernovae (SNeIa). The Chevallier-Polarski-Linder…