Binary neutron stars with arbitrary spins in numerical relativity

Nick Tacik, Francois Foucart, Harald P. Pfeiffer, Roland Haas, Serguei Ossokine, Jeff Kaplan, Curran Muhlberger, Matt D. Duez, Lawrence E. Kidder, Mark A. Scheel, Béla Szilágyi

Research output: Contribution to journalArticlepeer-review


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 quasilocal angular momentum integrals. When constructing irrotational binary neutron stars, we find a very small residual dimensionless spin of ∼2×10-4. 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 ∼0.1%. The neutron stars show quasinormal mode oscillations at an amplitude which increases with the rotation rate of the stars.

Original languageEnglish (US)
Article number124012
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number12
StatePublished - Dec 9 2015
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)


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