Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-05-19
Astrophys. J. Lett. 736, L6 (2011)
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
5 pages, 4 figures; small changes; accepted for publication in ApJL
Scientific paper
10.1088/2041-8205/736/1/L6
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.
Ciolfi Riccardo
Lander Samuel K.
Manca Gian Mario
Rezzolla Luciano
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