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Modeling the dynamics of tidally-interacting binary neutron stars up to merger

Bernuzzi, Sebastiano and Nagar, Alessandro and Dietrich, Tim and Damour, Thibault (2015) Modeling the dynamics of tidally-interacting binary neutron stars up to merger. Physical Review Letters, 114 (16). Art. No. 161103. ISSN 0031-9007.

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The data analysis of the gravitational wave signals emitted by coalescing neutron star binaries requires the availability of an accurate analytical representation of the dynamics and waveforms of these systems. We propose an effective-one-body model that describes the general relativistic dynamics of neutron star binaries from the early inspiral up to the merger. Our effective-one-body model incorporates an enhanced attractive tidal potential motivated by recent analytical advances in the post-Newtonian and gravitational self-force description of relativistic tidal interactions. No fitting parameters are introduced for the description of tidal interaction in the late, strong-field dynamics. We compare the model energetics and the gravitational wave phasing with new high-resolution multiorbit numerical relativity simulations of equal-mass configurations with different equations of state. We find agreement within the uncertainty of the numerical data for all configurations. Our model is the first semianalytical model that captures the tidal amplification effects close to merger. It thereby provides the most accurate analytical representation of binary neutron star dynamics and waveforms currently available.

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Additional Information:© 2015 American Physical Society. Received 15 December 2014; revised manuscript received 18 February 2015; published 23 April 2015. It is a pleasure to thank D. Bini for sharing with us unpublished results about the gravitomagnetic tides and M. Ujevic for providing us with the NR initial data. The EOB code developed here is publicly available [51]. S.B. acknowledges partial support from the National Science Foundation under Grants No. NSF AST-1333520, No. PHY-1404569, and No. AST-1205732. Ti.D. acknowledges partial support from the DFG Grant No. SFB/Transregio 7 “Gravitational Wave Astronomy” and the Graduierten-Akademie Jena. Computations were performed on LRZ (Munich).
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)SFB/Transregio 7
Graduierten-Akademie JenaUNSPECIFIED
Issue or Number:16
Classification Code:PACS: 04.25.D-, 04.30.Db, 95.30.Sf
Record Number:CaltechAUTHORS:20150518-152953626
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57621
Deposited By: Tony Diaz
Deposited On:19 May 2015 02:59
Last Modified:03 Oct 2019 08:26

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