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Accurate numerical simulations of inspiralling binary neutron stars and their comparison with effective-one-body analytical models

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons20657

Giacomazzo,  Bruno
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons20670

Rezzolla,  Luciano
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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1103.3874.pdf
(Preprint), 3MB

PRD84_024017.pdf
(Any fulltext), 3MB

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Citation

Baiotti, L., Damour, T., Giacomazzo, B., Nagar, A., & Rezzolla, L. (2011). Accurate numerical simulations of inspiralling binary neutron stars and their comparison with effective-one-body analytical models. Physical Review D, 84(2): 024017. doi:10.1103/PhysRevD.84.024017.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-06EF-6
Abstract
Binary neutron-star systems represent one of the most promising sources of gravitational waves. In order to be able to extract important information, notably about the equation of state of matter at nuclear density, it is necessary to have in hands an accurate analytical model of the expected waveforms. Following our recent work, we here analyze more in detail two general-relativistic simulations spanning about 20 gravitational-wave cycles of the inspiral of equal-mass binary neutron stars with different compactnesses, and compare them with a tidal extension of the effective-one-body (EOB) analytical model. The latter tidally extended EOB model is analytically complete up to the 1.5 post-Newtonian level, and contains an analytically undetermined parameter representing a higher-order amplification of tidal effects. We find that, by calibrating this single parameter, the EOB model can reproduce, within the numerical error, the two numerical waveforms essentially up to the merger. By contrast, analytical models (either EOB, or Taylor-T4) that do not incorporate such a higher-order amplification of tidal effects, build a dephasing with respect to the numerical waveforms of several radians.