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  On the black hole from merging binary neutron stars: how fast can it spin?

Kastaun, W., Galeazzi, F., Alic, D., Rezzolla, L., & Font, J. A. (2013). On the black hole from merging binary neutron stars: how fast can it spin? Physical Review D, 88: 021501. doi:10.1103/PhysRevD.88.021501.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-EB3F-E Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-543F-2
Genre: Journal Article

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1301.7348 (Preprint), 2MB
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 Creators:
Kastaun, Wolfgang, Author
Galeazzi, Filippo1, Author
Alic, Daniela1, Author              
Rezzolla, L.1, Author              
Font, José A., Author              
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc
 Abstract: The merger of two neutron stars will in general lead to the formation of a torus surrounding a black hole whose rotational energy can be tapped to potentially power a short gamma-ray burst. We have studied the merger of equal-mass binaries with spins aligned with the orbital angular momentum to determine the maximum spin the black hole can reach. Our initial data consists of irrotational binaries to which we add various amounts of rotation to increase the total angular momentum. Although the initial data violates the constraint equations, the use of the constraint-damping CCZ4 formulation yields evolutions with violations smaller than those with irrotational initial data and standard formulations. Interestingly, we find that a limit of $J/M^2 \simeq 0.89$ exists for the dimensionless spin and that any additional angular momentum given to the binary ends up in the torus rather than in the black hole, thus providing another nontrivial example supporting the cosmic censorship hypothesis.

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 Dates: 2013-01-302013
 Publication Status: Published in print
 Pages: 4 pages, 2 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1301.7348
DOI: 10.1103/PhysRevD.88.021501
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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: 88 Sequence Number: 021501 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258