Authors

Citation

M. Shibata et K. Uryu, Computation of gravitational waves from inspiraling binary neutron stars in quasiequilibrium circular orbits: Formulation and calibration - art. no. 104017, PHYS REV D, 6410(10), 2001, pp. 4017

Citations number

59

Language

INGLESE

art.tipo

Article

Categorie Soggetti

Physics

Journal title

PHYSICAL REVIEW D

ISSN journal

0556-2821
→ ACNP

Volume

6410

Issue

10

Year of publication

2001

Database

ISI

SICI code

0556-2821(20011115)6410:10<4017:COGWFI>2.0.ZU;2-#

Abstract

Gravitational waves from binary neutron stars in quasiequilibrium circular
orbits are computed using an approximate method which we propose in this pa
per. In the first step of-this method, we prepare general relativistic irro
tational binary neutron stars in a quasiequilibrium circular orbit, neglect
ing gravitational waves. We adopt the so-called conformal flatness approxim
ation for a three-metric to obtain the quasiequilibrium states in this pape
r. In the second step, we compute gravitational waves, solving linear pertu
rbation equations in the background spacetime of the quasiequilibrium state
s. Comparing numerical results with post-Newtonian waveforms and luminosity
of gravitational waves from two point masses in circular orbits, we demons
trate that this method can produce accurate waveforms and luminosity of gra
vitational waves. It is shown that the effects of tidal deformation of neut
ron stars and strong general relativistic gravity modify the post-Newtonian
results for compact binary neutron stars in close orbits. We indicate that
the magnitude of a systematic error in quasiequilibrium states associated
with the conformal flatness approximation is fairly large for close and com
pact binary neutron stars. Several formulations for improving the accuracy
of quasiequilibrium states are proposed.