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  Numerical Relativity Simulations of Precessing Binary Neutron Star Mergers

Dietrich, T., Bernuzzi, S., Bruegmann, B., Ujevic, M., & Tichy, W. (2018). Numerical Relativity Simulations of Precessing Binary Neutron Star Mergers. Physical Review D, 97(6): 064002. doi:10.1103/PhysRevD.97.064002.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-3D3C-A Version Permalink: http://hdl.handle.net/21.11116/0000-0002-E9BC-4
Genre: Journal Article

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 Creators:
Dietrich, Tim1, Author              
Bernuzzi, Sebastiano, Author
Bruegmann, Bernd, Author
Ujevic, Maximiliano, Author
Tichy, Wolfgang, Author
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: We present the first set of numerical relativity simulations of binary neutron mergers that include spin precession effects and are evolved with multiple resolutions. Our simulations employ consistent initial data in general relativity with different spin configurations and dimensionless spin magnitudes $\sim 0.1$. They start at a gravitational-wave frequency of $\sim392$~Hz and cover more than $1$ precession period and about 15 orbits up to merger. We discuss the spin precession dynamics by analyzing coordinate trajectories, quasi-local spin measurements, and energetics, by comparing spin aligned, antialigned, and irrotational configurations. Gravitational waveforms from different spin configuration are compared by calculating the mismatch between pairs of waveforms in the late inspiral. We find that precession effects are not distinguishable from nonprecessing configurations with aligned spins for approximately face-on binaries, while the latter are distinguishable from a nonspinning configurations. Spin precession effects are instead clearly visible for approximately edge-on binaries. For the parameters considered here, precession does not significantly affect the characteristic postmerger gravitational-wave frequencies nor the mass ejection. Our results pave the way for the modeling of spin precession effects in the gravitational waveform from binary neutron star events.

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 Dates: 2017-12-082018
 Publication Status: Published in print
 Pages: 12 pages, 10 figures, comments are welcome
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1712.02992
URI: http://arxiv.org/abs/1712.02992
DOI: 10.1103/PhysRevD.97.064002
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : American Physical Society
Pages: - Volume / Issue: 97 (6) Sequence Number: 064002 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258