401 citations · 2k across the 21 of their papers we have counts for
19 papers · 1 filter
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…
Imaging a boson star at the Galactic center
F. H. Vincent, Z. Meliani, P. Grandclement +2
Millimeter very long baseline interferometry will soon produce accurate images of the closest surroundings of the supermassive compact object at the center of the Galaxy, Sgr A*. T…
Models of rotating boson stars and geodesics around them: new type of orbits
Philippe Grandclement, Claire Somé, Eric Gourgoulhon
We have developed a highly accurate numerical code capable of solving the coupled Einstein-Klein-Gordon system, in order to construct rotating boson stars in general relativity. Fr…
New code for equilibriums and quasiequilibrium initial data of compact objects. II. Convergence tests and comparisons of binary black hole initial data
Koji Uryu, Antonios Tsokaros, Philippe Grandclement
COCAL is a code for computing equilibriums or quasiequilibrium initial data of single or binary compact objects based on finite difference methods. We present the results of supple…
Numerical simulation of oscillatons: extracting the radiating tail
P. Grandclement, G. Fodor, P. Forgacs
Spherically symmetric, time-periodic oscillatons -- solutions of the Einstein-Klein-Gordon system (a massive scalar field coupled to gravity) with a spatially localized core -- are…
Kadath: a spectral solver for theoretical physics
Philippe Grandclement
Kadath is a library that implements spectral methods in a very modular manner. It is designed to solve a wide class of problems that arise in the context of theoretical physics. Se…
Spectral Methods for Numerical Relativity
Philippe Grandclement, Jérôme Novak
Equations arising in General Relativity are usually too complicated to be solved analytically and one has to rely on numerical methods to solve sets of coupled partial differential…
Introduction to spectral methods
Philippe Grandclement
This proceeding is intended to be a first introduction to spectral methods. It is written around some simple problems that are solved explicitly and in details and that aim at demo…
Accurate and realistic initial data for black hole-neutron star binaries
Philippe Grandclement
This paper is devoted to the computation of compact binaries composed of one black hole and one neutron star. The objects are assumed to be on exact circular orbits. Standard 3+1 d…
Searching for Gravitational Waves from the Inspiral of Precessing Binary Systems: Astrophysical Expectations and Detection Efficiency of "Spiky'' Templates
Philippe Grandclement, Mia Ihm, Vassiliki Kalogera +1
Relativistic spin-orbit and spin-spin couplings has been shown to modify the gravitational waveforms expected from inspiraling binaries with a black hole and a neutron star. As a r…
Upper limits on the strength of periodic gravitational waves from PSR J1939+2134
B. Allen, G. Woan
The first science run of the LIGO and GEO gravitational wave detectors presented the opportunity to test methods of searching for gravitational waves from known pulsars. Here we pr…
A constrained scheme for Einstein equations based on Dirac gauge and spherical coordinates
S. Bonazzola, E. Gourgoulhon, P. Grandclement +1
We propose a new formulation for 3+1 numerical relativity, based on a constrained scheme and a generalization of Dirac gauge to spherical coordinates. This is made possible thanks…
Searching for Gravitational Waves from the Inspiral of Precessing Binary Systems: New Hierarchical Scheme using "Spiky" Templates
P. Grandclement, V. Kalogera
In a recent investigation of the effects of precession on the anticipated detection of gravitational-wave inspiral signals from compact object binaries with moderate total masses,…
Searching for Gravitational Waves from the Inspiral of Precessing Binary Systems: Problems with Current Waveforms
P. Grandclement, V. Kalogera, A. Vecchio
We consider the problem of searching for gravitational waves emitted during the inspiral phase of binary systems when the orbital plane precesses due to relativistic spin-orbit cou…
Circular orbits of corotating binary black holes: comparison between analytical and numerical results
T. Damour, E. Gourgoulhon, P. Grandclement
We compare recent numerical results, obtained within a ``helical Killing vector'' (HKV) approach, on circular orbits of corotating binary black holes to the analytical predictions…
Last orbits of binary black holes
Eric Gourgoulhon, Philippe Grandclement, Silvano Bonazzola
Binary black hole systems in the pre-coalescence stage are numerically constructed by demanding that the associated spacetime admits a helical Killing vector. Comparison with third…
Quasiequilibrium sequences of synchronized and irrotational binary neutron stars in general relativity. I. Method and tests
E. Gourgoulhon, P. Grandclement, K. Taniguchi +2
We present a numerical method to compute quasiequilibrium configurations of close binary neutron stars in the pre-coalescing stage. A hydrodynamical treatment is performed under th…
A multi-domain spectral method for scalar and vectorial Poisson equations with non-compact sources
P. Grandclement, S. Bonazzola, E. Gourgoulhon +1
We present a spectral method for solving elliptic equations which arise in general relativity, namely three-dimensional scalar Poisson equations, as well as generalized vectorial P…
Darwin-Riemann problems in general relativity
S. Bonazzola, E. Gourgoulhon, P. Grandclement +1
A review is given of recent results about the computation of irrotational Darwin-Riemann configurations in general relativity. Such configurations are expected to represent fairly…