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Binary Neutron Stars with Arbitrary Spins in Numerical Relativity

Tacik, N., Foucart, F., Pfeiffer, H. P., Haas, R., Ossokine, S., Kaplan, J., et al. (2015). Binary Neutron Stars with Arbitrary Spins in Numerical Relativity. Physical Review D, 92: 124012. doi:10.1103/PhysRevD.92.124012.

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Genre: Journal Article

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Creators:
Tacik, Nick, Author
Foucart, Francois, Author
Pfeiffer, Harald P., Author
Haas, Roland1, Author
Ossokine, Serguei1, Author
Kaplan, Jeff, Author
Muhlberger, Curran, Author
Duez, Matt D., Author
Kidder, Lawrence E., Author
Scheel, Mark A., Author
Szilágyi, Béla, Author
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:1933290

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
Abstract: We present a code to construct initial data for binary neutron star systems in which the stars are rotating. Our code, based on a formalism developed by Tichy, allows for arbitrary rotation axes of the neutron stars and is able to achieve rotation rates near rotational breakup. We compute the neutron star angular momentum through quasi-local angular momentum integrals. When constructing irrotational binary neutron stars, we find a very small residual dimensionless spin of $\sim 2\times 10^{-4}$. Evolutions of rotating neutron star binaries show that the magnitude of the stars' angular momentum is conserved, and that the spin- and orbit-precession of the stars is well described by post-Newtonian approximation. We demonstrate that orbital eccentricity of the binary neutron stars can be controlled to $\sim 0.1\%$. The neutron stars show quasi-normal mode oscillations at an amplitude which increases with the rotation rate of the stars.

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Dates: 2015-08-272015
Publication Status: Published in print
Pages: 20 pages, 22 figures
Publishing info: -
Rev. Method: -
Identifiers: arXiv: 1508.06986
DOI: 10.1103/PhysRevD.92.124012
URI: http://arxiv.org/abs/1508.06986
Degree: -

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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: 92 Sequence Number: 124012 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/111088197762258