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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-06EF-6 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-06F0-D
Genre: Journal Article

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 Creators:
Baiotti, Luca, Author
Damour, Thibault, Author
Giacomazzo, Bruno1, Author              
Nagar, Alessandro, Author
Rezzolla, Luciano1, Author              
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24013              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 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.

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 Dates: 2011-03-202011-10-122011
 Publication Status: Published in print
 Pages: 25 pages, 17 figs. Matched published version
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1103.3874
DOI: 10.1103/PhysRevD.84.024017
URI: http://arxiv.org/abs/1103.3874
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : Published for the American Physical Society by the American Institute of Physics
Pages: - Volume / Issue: 84 (2) Sequence Number: 024017 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111088197762258