arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1105.3971gr-qcastro-ph.HEastro-ph.SR
收藏

相对论恒星极向磁场的不稳定性驱动演化

Instability-driven evolution of poloidal magnetic fields in relativistic stars

Riccardo Ciolfi, Samuel K. Lander, Gian Mario Manca, Luciano Rezzolla

摘要:

恒星中磁场的稳定性问题有着悠久的历史,并在微扰论中得到了详细的研究。在广义相对论中,我们考虑了具有纯极向磁场的非旋转中子星的非线性演化。我们发现,一个不稳定的发展区域的封闭磁场线和阿尔芬时标,如微扰理论预测。经过初始的不稳定增长,我们的演变表明,一个环向磁场分量的产生,这增加,直到它是本地可比的强度与极向的。在较长的时间尺度上,系统松弛到一个新的非轴对称配置与重组的恒星结构和大振幅振荡,主要是在基本模式。我们讨论的能量参与的不稳定性和影响,它们可能对磁星耀斑的现象和它们的可探测性,通过引力波发射。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑