Publications (45)
Compact binaries detection rates from gravitational wave interferometers: comparison of different procedures
G. Corvino, V. Ferrari, S. Marassi +1
In this paper we perform a detailed analysis of the effect of various approximations which have been used in the literature to compute the detection rates of compact binary coalesc…
Gravitational signals due to tidal interactions between white dwarfs and black holes
C. Casalvieri, V. Ferrari, A. Stavridis
In this paper we compute the gravitational signal emitted when a white dwarf moves around a black hole on a closed or open orbit using the affine model approach. We compare the orb…
Gravitational signals emitted by a point mass orbiting a neutron star: a perturbative approach
L. Gualtieri, E. Berti, J. A. Pons +2
We compute the energy spectra of the gravitational signals emitted when a pointlike mass moves on a closed orbit around a non rotating neutron star, inducing a perturbation of its…
Relativistic r-modes and Shear viscosity: regularizing the continuous spectrum
J. A. Pons, L. Gualtieri, J. A. Miralles +1
Within a fully relativistic framework, we derive and solve numerically the perturbation equations of relativistic stars, including the stresses produced by a non-vanishing shear vi…
Efficient video annotation with visual interpolation and frame selection guidance
A. Kuznetsova, A. Talati, Y. Luo +2
We introduce a unified framework for generic video annotation with bounding boxes. Video annotation is a longstanding problem, as it is a tedious and time-consuming process. We tac…
Gravitational signals emitted by a point mass orbiting a neutron star: effects of stellar structure
J. A. Pons, E. Berti, L. Gualtieri +2
The effects that the structure of a neutron star would have on the gravitational emission of a binary system are studied in a perturbative regime, and in the frequency domain. Assu…
Non-radial oscillation modes as a probe of density discontinuities in neutron stars
G. Miniutti, J. A. Pons, E. Berti +2
A phase transition occurring in the inner core of a neutron star could be associated to a density discontinuity that would affect the frequency spectrum of the non-radial oscillati…
Ferrodistortive instability at the (001) surface of half-metallic manganites
J. M. Pruneda, V. Ferrari, P. B. Littlewood +2
We present the structure of the fully relaxed (001) surface of the half-metallic manganite La0.7Sr0.3MnO3, calculated using density functional theory within the generalized gradien…
Relativistic models of magnetars: structure and deformations
A. Colaiuda, V. Ferrari, L. Gualtieri +1
We find numerical solutions of the coupled system of Einstein-Maxwell's equations with a linear approach, in which the magnetic field acts as a perturbation of a spherical neutron…
Imprint of the merger and ring-down on the gravitational wave background from black hole binaries coalescence
S. Marassi, R. Schneider, G. Corvino +2
We compute the gravitational wave background (GWB) generated by a cosmological population of (BH-BH) binaries using hybrid waveforms recently produced by numerical simulations of (…
Relativistic models of magnetars: the twisted-torus magnetic field configuration
R. Ciolfi, V. Ferrari, L. Gualtieri +1
We find general relativistic solutions of equilibrium magnetic field configurations in magnetars, extending previous results of Colaiuda et al. (2008). Our method is based on the s…
Scattering of particles by neutron stars: Time-evolutions for axial perturbations
V. Ferrari, K. D. Kokkotas
The excitation of the axial quasi-normal modes of a relativistic star by scattered particles is studied by evolving the time dependent perturbation equations. This work is the firs…
Gravitational waves from neutron stars: Promises and challenges
N. Andersson, V. Ferrari, D. I. Jones +5
We discuss different ways that neutron stars can generate gravitational waves, describe recent improvements in modelling the relevant scenarios in the context of improving detector…
Fractional Aharonov-Bohm effect in mesoscopic rings
V. Ferrari, G. Chiappe
We study the effects of correlations on a one dimensional ring threaded by a uniform magnetic flux. In order to describe the interaction between particles, we work in the framework…
Gravitational Waves from Rotating Proto-Neutron Stars
V. Ferrari, L. Gualtieri, J. A. Pons +1
We study the effects of rotation on the quasi normal modes (QNMs) of a newly born proto neutron star (PNS) at different evolutionary stages, until it becomes a cold neutron star (N…
Effect of ELF e.m. fields on metalloprotein redox-active sites
A. De Ninno, M. Prosdocimi, V. Ferrari +4
The peculiarity of the distribution and geometry of metallic ions in enzymes pushed us to set the hypothesis that metallic ions in active-site act like tiny antennas able to pick u…
Co-doped Ceria: Tendency towards ferromagnetism driven by oxygen vacancies
V. Ferrari, A. M. Llois, V. Vildosola
We perform an electronic structure study for cerium oxide homogeneously-doped with cobalt impurities, focusing on the role played by oxygen vacancies and structural relaxation. By…
Relativistic r-modes and shear viscosity
L. Gualtieri, J. A. Pons, J. A. Miralles +1
We derive the relativistic equations for stellar perturbations, including in a consistent way shear viscosity in the stress-energy tensor, and we numerically integrate our equation…
Spin evolution of a proto-neutron star
G. Camelio, L. Gualtieri, J. A. Pons +1
We study the evolution of the rotation rate of a proto-neutron star, born in a core-collapse supernova, in the first seconds of its life. During this phase, the star evolution can…
Prospects for Fundamental Physics with LISA
Enrico Barausse, Emanuele Berti, Thomas Hertog +318
In this paper, which is of programmatic rather than quantitative nature, we aim to further delineate and sharpen the future potential of the LISA mission in the area of fundamental…
The Large Observatory For x-ray Timing
M. Feroci, J. W. den Herder, E. Bozzo +341
The Large Observatory For x-ray Timing (LOFT) was studied within ESA M3 Cosmic Vision framework and participated in the final down-selection for a launch slot in 2022-2024. Thanks…
Structure and deformations of strongly magnetized neutron stars with twisted torus configurations
R. Ciolfi, V. Ferrari, L. Gualtieri
We construct general relativistic models of stationary, strongly magnetized neutron stars. The magnetic field configuration, obtained by solving the relativistic Grad-Shafranov equ…
Gravitational waves from neutron stars described by modern EOS
O. Benhar, V. Ferrari, L. Gualtieri
The frequencies and damping times of neutron star (and quark star) oscillations have been computed using the most recent equations of state available in the literature. We find tha…
Rotational effects on the oscillation frequencies of newly born proto-neutron stars
V. Ferrari, L. Gualtieri, J. A. Pons +1
In this paper we study the effects of rotation on the frequencies of the quasi-normal modes of a proto-neutron star (PNS) born in a gravitational collapse during the first minute o…
On the validity of the adiabatic approximation in compact binary inspirals
A. Maselli, L. Gualtieri, F. Pannarale +1
Using a semi-analytical approach recently developed to model the tidal deformations of neutron stars in inspiralling compact binaries, we study the dynamical evolution of the tidal…
Bistability of persistent currents in mesoscopic rings
E. Anda, V. Ferrari, G. Chiappe
We study the persistent currents flowing in a mesoscopic ring threaded by a magnetic flux and connected to a stub of finite length. Multistability processes and Coulomb blockade ar…
Gravitational Waves Signals from the Collapse of the First Stars
R. Schneider, A. Ferrara, B. Ciardi +2
We study the gravitational wave emission from the first stars which are assumed to be Very Massive Objects (VMOs). We take into account various feedback (both radiative and stellar…
Ab initio study of magnetism at the TiO2/LaAlO3 interface
Mariana Weissmann, V. Ferrari, Andres Saul
In this paper we study the possible relation between the electronic and magnetic structure of the TiO2/LaAlO3 interface and the unexpected magnetism found in undoped TiO2 films gro…
Tidal interaction in compact binaries: a post-Newtonian affine framework
V. Ferrari, L. Gualtieri, A. Maselli
We develop a semi-analytical approach, based on the post-Newtonian expansion and on the affine approximation, to model the tidal deformation of neutron stars in the coalescence of…
Are Post-Newtonian templates faithful and effectual in detecting gravitational signals from neutron star binaries?
E. Berti, J. A. Pons, G. Miniutti +2
We compute the overlap function between Post-Newtonian (PN) templates and gravitational signals emitted by binary systems composed of one neutron star and one point mass, obtained…
Unstable g-modes in Proto-Neutron Stars
V. Ferrari, L. Gualtieri, J. A. Pons
In this article we study the possibility that, due to non-linear couplings, unstable g-modes associated to convective motions excite stable oscillating g-modes. This problem is of…
Reversible switching of room temperature ferromagnetism in CeO2-Co nanoparticles
J. Sacanell, M. A. Paulin, V. Ferrari +2
We investigated the reversible ferromagnetic (FM) behavior of pure and Co doped CeO2 nanopowders. The as-sintered samples displayed an increasing paramagnetic contribution upon Co…
Quasi-Normal Modes and Gravitational Wave Astronomy
V. Ferrari, L. Gualtieri
We review the main results obtained in the literature on quasi-normal modes of compact stars and black holes, in the light of recent exciting developments of gravitational wave det…
Structure, Deformations and Gravitational Wave Emission of Magnetars
L. Gualtieri, R. Ciolfi, V. Ferrari
Neutron stars can have, in some phases of their life, extremely strong magnetic fields, up to 10^15-10^16 G. These objects, named magnetars, could be powerful sources of gravitatio…
The anomalous metallic ferromagnetic state of Sr doped manganites
V. Ferrari, M. J. Rozenberg, R. Weht
We deduce a model relevant for the anomalous metallic state of Sr doped manganites at low temperatures within the ferromagnetic phase. It provides a natural explanation to several…
Oscillations of hot, young neutron stars: Gravitational wave frequencies and damping times
G. F. Burgio, V. Ferrari, L. Gualtieri +1
We study how the frequencies and damping times of oscillations of a newly born, hot proto-neutron star depend on the physical quantities which characterize the star quasi-stationar…
Scientific Objectives of Einstein Telescope
B. Sathyaprakash, M. Abernathy, F. Acernese +222
The advanced interferometer network will herald a new era in observational astronomy. There is a very strong science case to go beyond the advanced detector network and build detec…
Gravitational Wave asteroseismology revisited
O. Benhar, V. Ferrari, L. Gualtieri
The frequencies and damping times of the non radial oscillations of neutron stars are computed for a set of recently proposed equations of state (EOS) which describe matter at supr…
Oxygen-stripes in La0.5Ca0.5MnO3 from ab initio calculations
V. Ferrari, M. D. Towler, P. B. Littlewood
We investigate the electronic, magnetic and orbital properties of La0.5Ca0.5MnO3 perovskite by means of an ab initio electronic structure calculation within the Hartree-Fock approx…
Stellar Pulsations excited by a scattered mass
V. Ferrari, L. Gualtieri, A. Borrelli
We compute the energy spectra of the gravitational signals emitted when a mass m is scattered by the gravitational field of a star of mass M >> m. We show that, unlike black holes…
Neutron star tidal disruption in mixed binaries: the imprint of the equation of state
V. Ferrari, L. Gualtieri, F. Pannarale
We study the tidal disruption of neutron stars in black hole-neutron star coalescing binaries. We calculate the critical orbital separation at which the star is disrupted by the bl…
A new approach to the study of quasi-normal modes of rotating stars
V. Ferrari, L. Gualtieri, S. Marassi
We propose a new method to study the quasi-normal modes of rotating relativistic stars. Oscillations are treated as perturbations in the frequency domain of the stationary, axisymm…
A Semi-relativistic Model for Tidal Interactions in BH-NS Coalescing Binaries
V. Ferrari, L. Gualtieri, F. Pannarale
We study the tidal effects of a Kerr black hole on a neutron star in black hole-neutron star binary systems using a semi-analytical approach which describes the neutron star as a d…
The imprint of the equation of state on the axial w-modes of oscillating neutron stars
O. Benhar, E. Berti, V. Ferrari
We discuss the dependence of the pulsation frequencies of the axial quasi-normal modes of a nonrotating neutron star upon the equation of state describing the star interior. The co…
Density functionals and half-metalicity in La2/3Sr1/3MnO3
V. Ferrari, J. M. Pruneda, Emilio Artacho
The electronic structure and equilibrium geometry of La2/3Sr1/3MnO3 are studied theoretically by means of density functional calculations. The doping is treated by introducing hole…