磁化史瓦西黑洞的有效势与稳定圆轨道

刘文芳; 周娜英; 张洪星; 孙鑫

doi:10.12299/jsues.22-0338

磁化史瓦西黑洞的有效势与稳定圆轨道

doi: 10.12299/jsues.22-0338

刘文芳^{1a, 1b,},
周娜英^{1a, 1b,},
张洪星^{1a, 1b},
孙鑫²

1a.
数理与统计学院
1b.
计算物理与应用研究中心, 上海 201620
2.
广西大学物理科学与工程技术学院, 南宁 530004

详细信息

作者简介:
刘文芳（1970−），女，实验师，本科，研究方向为天文科普与天体力学数值方法. E-mail：21200007@sues.edu.cn

中图分类号: P138
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- 被引次数: 0
出版历程
- 收稿日期: 2022-11-11
- 刊出日期: 2023-09-30

Effective potential and stable circular orbits in magnetized Schwarzschild spacetime

LIU Wenfang^{1a, 1b
,},
ZHOU Naying^{1a, 1b
,},
ZHANG Hongxing^{1a, 1b},
SUN Xin²

1a.
School of Mathematics, Physics and Statistics
1b.
Center of Application and Research of Computational Physics, Shanghai University of Engineering Science, Shanghai 201620, China
2.
School of Physical Science and Technology, Guangxi University, Nanning 530004, China

摘要

摘要: 利用赤道平面上的径向有效势研究带电粒子在有外部磁场的史瓦西黑洞附近的圆轨道运动，发现针对某特定的角动量和较小的外部磁场，稳定圆轨道很难存在；但随着磁感应强度的增大，稳定圆轨道容易形成，并且磁感应强度的增大会导致稳定圆轨道半径逐渐减小. 稳定圆轨道半径随着角动量的增大而逐渐增大. 角动量和径向距离函数曲线与径向距离和有效势在讨论圆轨道性质上具有同等效果.
- 黑洞 /
- 磁场 /
- 有效势 /
- 稳定圆轨道
Abstract: An effective potential in the equatorial plane was used to study the circular motion of charged particles near the Schwarzschild black hole immersed into an external magnetic field. It is found that no stable circular orbits exist for some angular momenta and small magnetic fields. However, the stable circular orbit easily occurs and has small radius when the magnetic induction increases. The radius of stable circular orbit increases with an increase of the angular momentum. The relation between the angular momentum and a radial distance can show the features of circular orbits, as the relation between the effective potential and the radial distance can.
- black hole /
- magnetic field /
- effective potential /
- stable circular orbits

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图 1 3个不同磁感应强度的有效势分布

Figure 1. Effective potential distribution of three different magnetic induction

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图 2 2维有效势能级分布

Figure 2. 2D effective potential energy level distribution

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图 3 不同的磁感应强度下，有效势随着试验粒子角动量变化的分布

Figure 3. Distribution of effective potential with angular momentum of the test particle under different magnetic induction

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图 4 与有效势对应的角动量L与轨道半径r的函数关系曲线

Figure 4. Functional relationship curve between angular momentum L and orbital radius r corresponding to effective potential

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图 5 在不同能量和磁感应强度情况下的角动量L与轨道半径r的函数关系曲线

Figure 5. Functional relation curve of angular momentum L and orbital radius r under different energy and magnetic field intensity

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图 6 不稳定圆轨道对应的有效势$ {V}_{{\rm{max}}} $和稳定圆轨道对应的有效势$ {V}_{{\rm{min}}} $与$ L $的函数关系

Figure 6. Functional relationship between effective potential $ {V}_{{\rm{min}}} $ corresponding to unstable circular orbits and effective potential $ {V}_{{\rm{max}}} $ corresponding to stable circular orbits and $ L $

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表 1 与图1对应的圆轨道半径r值

Table 1. Radii r of circular orbit corresponding to Fig.1

磁感应强度	r	$ E^{2}\left(V_{\text {eff }}\right) $	$V_{\text {eff } }^{\prime \prime}$	稳定性
B=0	3.618937	1.170126	−0.162335	不稳定
B=0	17.541063	0.946911	0.000294	稳定
B=0.01	3.577530	1.149839	−0.174817	不稳定
B=0.01	16.351999	0.912641	0.000519	稳定
B=0.1	3.313035	0.988926	−0.272909	不稳定
B=0.1	7.986825	0.772967	0.016335	稳定

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表 2 与图3对应的圆轨道半径r值

Table 2. Radii r of circular orbit corresponding to Fig.3

磁感应强度	L=6.5				L=8
磁感应强度	r	$ E^{2}\left(V_{\text {eff }}\right) $	$V_{\text {eff } }^{\prime \prime}$	稳定性	r	$ E^{2}\left(V_{\text {eff }}\right) $	$V_{\text {eff } }^{\prime \prime}$	稳定性
B=0	3.250000	1.923077	−0.640874	不稳定	3.155590	2.719855	−1.163588	不稳定
B=0	39.000000	0.975071	0.000030	稳定	60.844410	0.983849	0.000008	稳定
B=0.01	3.231197	1.898294	−0.664131	不稳定	3.141993	2.690759	−1.194549	不稳定
B=0.01	26.817870	0.936274	0.000273	稳定	32.780111	0.945019	0.000238	稳定
B=0.1	3.090400	1.692793	−0.860438	不稳定	3.035547	2.445489	−1.460505	不稳定
B=0.1	10.398772	0.816597	0.017095	稳定	11.870141	0.836892	0.017346	稳定

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表 3 不同磁感应强度影响下最内稳定圆轨道半径(r_ISCO)、最内稳定圆轨道角动量(L_ISCO)及E²的值

Table 3. Values of r_ISCO, L_ISCO and value E² under influence of different magnetic field intensities

参数	${\mathit{r} }_{{\rm{ISCO}} }$	${\mathit{L} }_{\rm{ISCO} }$	$ {\mathit{E}}^{2} $	${ {L}_{{\rm{ISCO}}} }^{\prime \prime}$
B=−0.1	5.025714	4.626777	1.428876	−4.560000×10⁻⁸
B=0	6.000000	3.464102	0.888889	−3.608436×10⁻⁸
B=0.1	4.696670	3.359201	0.706673	−6.101820×10⁻⁷

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表 4 角动量$L=4.6$不同磁感应强度影响下$ { r} $及$ {E}^{2} $值

Table 4. values of$ r $ and $ {E}^{2} $under influences of different magnetic induction with angular momentum $ L=4.6 $

参数	r	$ {\mathit{E}}^{2} $
B=0	3.618937	1.170126
B=0	17.541063	0.946911
B=0.01	3.577530	1.149839
B=0.01	16.351999	0.912641
B=0.1	3.313035	0.988926
B=0.1	7.986825	0.772967

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表 5 不同磁感应强度下$ r$、$ {E}^{2} $及对应$ L $值

Table 5. $ r $, $ {E}^{2} $ and corresponding $ L $ under different magnetic induction

参数	r	$ \mathit{L} $	$ {\mathit{L}}^{\prime \prime} $	稳定性
B=0, $ {\mathit{E}}^{2}=0.946911 $	4.295401	3.773997	0.151900	不稳定
B=0, $ {\mathit{E}}^{2}=0.946911 $	17.541063	4.599999	−0.011102	稳定
B=0.01, $ {\mathit{E}}^{2}=0.942903 $	4.295814	3.706091	0.152276	不稳定
B=0.01, $ {\mathit{E}}^{2}=0.942903 $	16.351999	4.599998	−0.024210	稳定
B=0.1, $ {\mathit{E}}^{2}=0.772967 $	3.705074	3.740838	0.389130	不稳定
B=0.1, $ {\mathit{E}}^{2}=0.772967 $	7.986825	4.599998	−0.492759	稳定

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