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  General-relativistic resistive-magnetohydrodynamic simulations of binary neutron stars

Dionysopoulou, K., Alic, D., & Rezzolla, L. (2015). General-relativistic resistive-magnetohydrodynamic simulations of binary neutron stars. Physical Review D, 92: 084064. doi:10.1103/PhysRevD.92.084064.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0B0C-F Version Permalink: http://hdl.handle.net/21.11116/0000-0002-9AC9-E
Genre: Journal Article

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Dionysopoulou, K., Author
Alic, D.1, Author              
Rezzolla, L., 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, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR
 Abstract: We have studied the dynamics of an equal-mass magnetized neutron-star binary within a resistive magnetohydrodynamic (RMHD) approach in which the highly conducting stellar interior is matched to an electrovacuum exterior. Because our analysis is aimed at assessing the modifications introduced by resistive effects on the dynamics of the binary after the merger and through to collapse, we have carried out a close comparison with an equivalent simulation performed within the traditional ideal magnetohydrodynamic approximation. We have found that there are many similarities between the two evolutions but also one important difference: the survival time of the hyper massive neutron star increases in a RMHD simulation. This difference is due to a less efficient magnetic-braking mechanism in the resistive regime, in which matter can move across magnetic-field lines, thus reducing the outward transport of angular momentum. Both the RMHD and the ideal magnetohydrodynamic simulations carried here have been performed at higher resolutions and with a different grid structure than those in previous work of ours [L. Rezzolla, B. Giacomazzo, L. Baiotti, J. Granot, C. Kouveliotou, and M. A. Aloy, Astrophys. J. Letters 732, L6 (2011)], but confirm the formation of a low-density funnel with an ordered magnetic field produced by the black hole--torus system. In both regimes the magnetic field is predominantly toroidal in the highly conducting torus and predominantly poloidal in the nearly evacuated funnel. Reconnection processes or neutrino annihilation occurring in the funnel, none of which we model, could potentially increase the internal energy in the funnel and launch a relativistic outflow, which, however, is not produced in these simulations.

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 Dates: 2015-02-062015-11-092015
 Publication Status: Published in print
 Pages: 26 pages, 17 figures; animations available at http://www.southampton.ac.uk/~kd10g13/movies/index.shtml
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 Identifiers: arXiv: 1502.02021
DOI: 10.1103/PhysRevD.92.084064
URI: http://arxiv.org/abs/1502.02021
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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: 084064 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258