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  Instability-driven evolution of poloidal magnetic fields in relativistic stars

Ciolfi, R., Lander, S. K., Manca, G. M., & Rezzolla, L. (2011). Instability-driven evolution of poloidal magnetic fields in relativistic stars. Astrophysical Journal, Letters, 736(1): L6. doi:10.1088/2041-8205/736/1/L6.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-0937-A Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-0938-8
Genre: Journal Article

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1105.3971 (Preprint), 2MB
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 Creators:
Ciolfi, Riccardo, Author
Lander, Samuel K., Author
Manca, Gian Mario1, Author              
Rezzolla, Luciano2, Author              
Affiliations:
1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              
2Astrophysical 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: The problem of the stability of magnetic fields in stars has a long history and has been investigated in detail in perturbation theory. Here we consider the nonlinear evolution of a non-rotating neutron star with a purely poloidal magnetic field, in general relativity. We find that an instability develops in the region of the closed magnetic field lines and over an Alfven timescale, as predicted by perturbation theory. After the initial unstable growth, our evolutions show that a toroidal magnetic field component is generated, which increases until it is locally comparable in strength with the poloidal one. On longer timescales the system relaxes to a new non-axisymmetric configuration with a reorganization of the stellar structure and large-amplitude oscillations, mostly in the fundamental mode. We discuss the energies involved in the instability and the impact they may have on the phenomenology of magnetar flares and on their detectability through gravitational-wave emission.

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 Dates: 2011-05-192011-06-122011
 Publication Status: Published in print
 Pages: 5 pages, 4 figures; small changes; accepted for publication in ApJL
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1105.3971
DOI: 10.1088/2041-8205/736/1/L6
URI: http://arxiv.org/abs/1105.3971
 Degree: -

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Title: Astrophysical Journal, Letters
  Other : ApJL
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 736 (1) Sequence Number: L6 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: /journals/resource/954922828215_1