An improved algorithm for crossing curved light surfaces: rapidly rotating pulsar magnetospheres in curved space-time

doi:10.1093/mnras/sty1761

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	An improved algorithm for crossing curved light surfaces: rapidly rotating pulsar magnetospheres in curved space-time
	Huang, Lei 3; Pan, Zhen 1; Yu, Cong 2
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2018-10-01
卷号	479 期号:4 页码:4499-4508
关键词	Gravitation Relativistic Processes Magnetic Fields
ISSN号	0035-8711
DOI	10.1093/mnras/sty1761
英文摘要	The structure of force-free, steady, and axisymmetric magnetosphere of a neutron star (NS) is governed by the Grad-Shafranov (GS) equation, which is a second-order differential equation but degrades to first order on the light surface (LS). The key to numerically solving the GS equation is to enable magnetic field lines to smoothly cross the LS, and crossing a straight LS in flat space-time has been a well-studied problem. But the numerical algorithm implementation becomes complicate in the presence of a bent LS, e.g. in curved space-time, since there is no suitable computation grid adapted to it. We propose to circumvent this grid-LS mismatch problem by introducing a new coordinate frame designed such that the LS in it is a straight line. As an application, we investigate the general relativistic (GR) effect in magnetosphere structure of rapidly rotating pulsars in detail, where the LS is bent towards the central NS. We split the GR effect into two parts, curvature and frame-dragging, measure each of them, and examine their dependence on the NS mass and the angular velocity for pulsars embedded in aligned dipole and multipole magnetic fields. Qualitatively speaking, we find that the curvature effect compactifies the magnetic field lines near the NS, therefore reduces the open magnetic flux and the Poynting luminosity, while the frame-dragging effect contributes a minor part in shaping the magnetosphere structure but plays a role in enhancing the space-like current generation.
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000441383700016
内容类型	期刊论文
源URL	[http://119.78.226.72/handle/331011/32249]
专题	中国科学院上海天文台
通讯作者	Huang, Lei
作者单位	1.Univ Calif Davis, Dept Phys, Davis, CA 95616 USA 2.Sun Yat Sen Univ, Sch Phys & Astron, Zhuhai 519082, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Huang, Lei,Pan, Zhen,Yu, Cong. An improved algorithm for crossing curved light surfaces: rapidly rotating pulsar magnetospheres in curved space-time[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2018,479(4):4499-4508.
APA	Huang, Lei,Pan, Zhen,&Yu, Cong.(2018).An improved algorithm for crossing curved light surfaces: rapidly rotating pulsar magnetospheres in curved space-time.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,479(4),4499-4508.
MLA	Huang, Lei,et al."An improved algorithm for crossing curved light surfaces: rapidly rotating pulsar magnetospheres in curved space-time".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 479.4(2018):4499-4508.