Gravitational waveforms for neutron star binaries from binary black hole simulations

Kevin Barkett, Mark A. Scheel, Roland Haas, Christian D. Ott, Sebastiano Bernuzzi, Duncan A. Brown, Béla Szilágyi, Jeffrey D. Kaplan, Jonas Lippuner, Curran D. Muhlberger, Francois Foucart, Matthew D. Duez

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Gravitational waves from binary neutron star (BNS) and black hole/neutron star (BHNS) inspirals are primary sources for detection by the Advanced Laser Interferometer Gravitational-Wave Observatory. The tidal forces acting on the neutron stars induce changes in the phase evolution of the gravitational waveform, and these changes can be used to constrain the nuclear equation of state. Current methods of generating BNS and BHNS waveforms rely on either computationally challenging full 3D hydrodynamical simulations or approximate analytic solutions. We introduce a new method for computing inspiral waveforms for BNS/BHNS systems by adding the post-Newtonian (PN) tidal effects to full numerical simulations of binary black holes (BBHs), effectively replacing the nontidal terms in the PN expansion with BBH results. Comparing a waveform generated with this method against a full hydrodynamical simulation of a BNS inspiral yields a phase difference of <1 radian over ∼15 orbits. The numerical phase accuracy required of BNS simulations to measure the accuracy of the method we present here is estimated as a function of the tidal deformability parameter λ.

Original languageEnglish (US)
Article number044064
JournalPhysical Review D
Volume93
Issue number4
DOIs
StatePublished - Feb 24 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Barkett, K., Scheel, M. A., Haas, R., Ott, C. D., Bernuzzi, S., Brown, D. A., Szilágyi, B., Kaplan, J. D., Lippuner, J., Muhlberger, C. D., Foucart, F., & Duez, M. D. (2016). Gravitational waveforms for neutron star binaries from binary black hole simulations. Physical Review D, 93(4), [044064]. https://doi.org/10.1103/PhysRevD.93.044064