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  Magnetorotational instability in relativistic hypermassive neutron stars

Siegel, D. M., Ciolfi, R., Harte, A. I., & Rezzolla, L. (2013). Magnetorotational instability in relativistic hypermassive neutron stars. Physical Review D, 87: 121302. doi:10.1103/PhysRevD.87.121302.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-E990-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-2737-9
Genre: Journal Article

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1302.4368 (Preprint), 3MB
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 Creators:
Siegel, Daniel M.1, Author
Ciolfi, Riccardo1, Author
Harte, Abraham I.1, Author              
Rezzolla, Luciano1, 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: A differentially rotating hypermassive neutron star (HMNS) is a metastable object which can be formed in the merger of neutron-star binaries. The eventual collapse of the HMNS into a black hole is a key element in generating the physical conditions expected to accompany the launch of a short gamma-ray burst. We investigate the influence of magnetic fields on HMNSs by performing three-dimensional simulations in general-relativistic magnetohydrodynamics. In particular, we provide direct evidence for the occurrence of the magnetorotational instability (MRI) in HMNS interiors. For the first time in simulations of these systems, rapidly-growing and spatially-periodic structures are observed to form with features like those of the channel flows produced by the MRI in other systems. Moreover, the growth time and wavelength of the fastest-growing mode are extracted and compared successfully with analytical predictions. The MRI emerges as an important mechanism to amplify magnetic fields over the lifetime of the HMNS, whose collapse to a black hole is accelerated. The evidence provided here that the MRI can actually develop in HMNSs could have a profound impact on the outcome of the merger of neutron-star binaries and on its connection to short gamma-ray bursts.

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 Dates: 2013-02-182013
 Publication Status: Published in print
 Pages: 5 pages, 4 figures
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1302.4368
DOI: 10.1103/PhysRevD.87.121302
 Degree: -

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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: 87 Sequence Number: 121302 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258