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arXiv 1604.04625astro-ph.HEgr-qc
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脉冲星磁层:超越平坦时空偶极

Pulsar Magnetospheres: Beyond the Flat Spacetime Dipole

Samuel E. Gralla, Alexandru Lupsasca, Alexander Philippov

摘要:

大多数关于脉冲星磁层的研究都假设在平坦时空中存在一个纯磁偶极子。然而,最近的工作表明,广义相对论的影响实际上是至关重要的,现实的脉冲星磁场将有一个显着的非偶极分量。本文介绍了一种研究任意磁场、质量、半径和转动惯量的慢转恒星的轴对称无力磁层的一般分析方法,包括了广义相对论的所有效应。我们确认,类空电流是一般存在于极冠(建议对生产区),无论恒星磁场。我们表明,广义相对论介绍了一个~60%的修正公式的偶极分量的表面磁场推断自旋下降。最后,我们表明,极帽的位置和形状可以显着修改,甚至适度强的高阶矩。这可能会影响恒星附近发生的发射过程,并可能有助于解释毫秒双星的光束特征。

英文摘要:

Most studies of the pulsar magnetosphere have assumed a pure magnetic dipole in flat spacetime. However, recent work suggests that the effects of general relativity are in fact of vital importance and that realistic pulsar magnetic fields will have a significant nondipolar component. We introduce a general analytical method for studying the axisymmetric force-free magnetosphere of a slowly-rotating star of arbitrary magnetic field, mass, radius and moment of inertia, including all the effects of general relativity. We confirm that spacelike current is generically present in the polar caps (suggesting a pair production region), irrespective of the stellar magnetic field. We show that general relativity introduces a ~60% correction to the formula for the dipolar component of the surface magnetic field inferred from spindown. Finally, we show that the location and shape of the polar caps can be modified dramatically by even modestly strong higher moments. This can affect emission processes occurring near the star and may help explain the modified beam characteristics of millisecond pulsars.

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。

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