The activity of magnetars is powered by their intense and dynamic magnetic fields and has been proposed as the trigger to extragalactic fast radio bursts. Here we estimate the frequency of crustal failures in young magnetars, by computing the magnetic stresses in detailed magnetothermal simulations including Hall drift and ohmic dissipation. The initial internal topology at birth is poorly known but is likely to be much more complex than a dipole. Thus, we explore a wide range of initial configurations, finding that the expected rate of crustal failures varies by orders of magnitude depending on the initial magnetic configuration. Our results show that this rate scales with the crustal magnetic energy, rather than with the often used surface value of the dipolar component related to the spin-down torque. The estimated frequency of crustal failures for a given dipolar component can vary by orders of magnitude for different initial conditions, depending on how much magnetic energy...

中文翻译：

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关于年轻电磁体的地壳破坏率

磁星的活动由其强磁场和动态磁场提供动力，并被提议作为银河外快速无线电脉冲的触发因素。在这里，我们通过计算详细的磁热模拟（包括霍尔漂移和欧姆耗散）中的磁应力，来估算年轻磁星中地壳破裂的频率。出生时的初始内部拓扑知之甚少，但可能比偶极子复杂得多。因此，我们探索了各种各样的初始构造，发现地壳破坏的预期速率取决于初始磁性构造而变化了几个数量级。我们的结果表明，该速率与地壳磁能成比例，而不与与旋转转矩相关的偶极分量的常用表面值成比例。