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Black hole from merging binary neutron stars: How fast can it spin?

Wolfgang Kastaun, Filippo Galeazzi, Daniela Alic, Luciano Rezzolla, and José A. Font
Phys. Rev. D 88, 021501(R) – Published 2 July 2013

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 conformal and covariant Z4 formulation yields evolutions with violations smaller than those with irrotational initial data and standard formulations. Interestingly, we find that a limit of J/M20.89 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.

  • Figure
  • Figure
  • Received 1 February 2013

DOI:https://doi.org/10.1103/PhysRevD.88.021501

© 2013 American Physical Society

Authors & Affiliations

Wolfgang Kastaun1, Filippo Galeazzi2,1, Daniela Alic1, Luciano Rezzolla1, and José A. Font2

  • 1Max-Planck-Institut für Gravitationsphysik, Albert-Einstein-Institut, Potsdam 14476, Germany
  • 2Departamento de Astronomía y Astrofísica, Universitat de València, Dr. Moliner 50, 46100 Burjassot (València), Spain

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Vol. 88, Iss. 2 — 15 July 2013

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