Collapse of magnetized hypermassive neutron stars in general relativity: Disk evolution and outflows

We study the evolution in axisymmetry of accretion disks formed self-consistently through collapse of magnetized hypermassive neutron stars to black holes. Such stars can arise following the merger of binary neutron stars. They are differentially rotating, dynamically stable, and have rest masses ex...

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Veröffentlicht in:Physical review. D, Particles and fields Particles and fields, 2008-02, Vol.77 (4), Article 044001
Hauptverfasser: Stephens, Branson C., Shapiro, Stuart L., Liu, Yuk Tung
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container_title Physical review. D, Particles and fields
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creator Stephens, Branson C.
Shapiro, Stuart L.
Liu, Yuk Tung
description We study the evolution in axisymmetry of accretion disks formed self-consistently through collapse of magnetized hypermassive neutron stars to black holes. Such stars can arise following the merger of binary neutron stars. They are differentially rotating, dynamically stable, and have rest masses exceeding the mass limit for uniform rotation. However, hypermassive neutron stars are secularly unstable to collapse due to MHD-driven angular momentum transport. The rotating black hole which forms in this process is surrounded by a hot, massive, magnetized torus and a magnetic field collimated along the spin axis. This system is a candidate for the central engine of a short-hard gamma-ray burst (GRB). Our code integrates the coupled Einstein-Maxwell-MHD equations and is used to follow the collapse of magnetized hypermassive neutron star models in full general relativity until the spacetime settles down to a quasistationary state. We then employ the Cowling approximation, in which the spacetime is frozen, to track the subsequent evolution of the disk. This approximation allows us to greatly extend the disk evolutions and study the resulting outflows, which may be relevant to the generation of a GRB. We find that outflows are suppressed when a stiff equation of state is assumed for low-density disk material and are sensitive to the initial magnetic field configuration.
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ispartof Physical review. D, Particles and fields, 2008-02, Vol.77 (4), Article 044001
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1550-2368
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language eng
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source American Physical Society Journals
subjects ACCRETION DISKS
APPROXIMATIONS
BLACK HOLES
COSMIC GAMMA BURSTS
COSMOLOGY
EQUATIONS OF STATE
GENERAL RELATIVITY THEORY
MAGNETIC FIELD CONFIGURATIONS
MAGNETIC FIELDS
MAGNETOHYDRODYNAMICS
MASS
NEUTRON STARS
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ROTATION
SPACE-TIME
SPIN
title Collapse of magnetized hypermassive neutron stars in general relativity: Disk evolution and outflows
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