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  Bar-mode instability suppression in magnetized relativistic stars

Franci, L., De Pietri, R., Dionysopoulou, K., & Rezzolla, L. (2013). Bar-mode instability suppression in magnetized relativistic stars. Journal of Physics: Conference Series, 470: 012008. doi:10.1088/1742-6596/470/1/012008.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0080-0 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002B-0081-E
Genre: Journal Article

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 Creators:
Franci, Luca, Author
De Pietri, Roberto, Author
Dionysopoulou, Kyriaki, 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
 Abstract: We show that magnetic fields stronger than about $10^{15}$ G are able to suppress the development of the hydrodynamical bar-mode instability in relativistic stars. The suppression is due to a change in the rest-mass density and angular velocity profiles due to the formation and to the linear growth of a toroidal component that rapidly overcomes the original poloidal one, leading to an amplification of the total magnetic energy. The study is carried out performing three-dimensional ideal-magnetohydrodynamics simulations in full general relativity, superimposing to the initial (matter) equilibrium configurations a purely poloidal magnetic field in the range $10^{14}-10^{16}$ G. When the seed field is a few parts in $10^{15}$ G or above, all the evolved models show the formation of a low-density envelope surrounding the star. For much weaker fields, no effect on the matter evolution is observed, while magnetic fields which are just below the suppression threshold are observed to slow down the growth-rate of the instability.

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 Dates: 2013-09-252013
 Publication Status: Published in print
 Pages: 6 pages, 4 figures, to appear on the proceedings of the 4th YRM (Trieste 2013)
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 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1309.6549
DOI: 10.1088/1742-6596/470/1/012008
URI: http://arxiv.org/abs/1309.6549
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Title: Journal of Physics: Conference Series
Source Genre: Journal
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Pages: - Volume / Issue: 470 Sequence Number: 012008 Start / End Page: - Identifier: -