Geodesics of Spherical Dilaton Spacetimes |
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作者姓名: | ZENG Yi Lü Jun-Li WANG Yong-Jiu |
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基金项目: | Supported by the Foundation of Education Committee of Hunan Province under Grant No 03c230. |
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摘 要: | The properties of spherical dilaton black hole spacetimes are investigated through a study of their geodesics. The closed and non-closed orbits of test particles are analysed using the effective potential and phase-plane method. The stability and types of orbits are determined in terms of the energy and angular momentum of the test particles. The conditions of the existence of circular orbits for a spherical dilaton spacetime with an arbitrary dilaton coupling constant α are obtained. The properties of the orbits and in particular the position of the innermost stable circular orbit are compared to those of the Reissner-Nordstrom spacetime. The circumferential radius of innermost stable circular orbit and the corresponding angular momentum of the test particles increase for α≠ 0.
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关 键 词: | 黑洞 时空 非闭合轨道 有效位势 |
收稿时间: | 2006-02-17 |
修稿时间: | 2006-02-17 |
Geodesics of Spherical Dilaton Spacetimes |
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Institution: | Department of Physics, Hunan Normal University, Changsha 410081 |
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Abstract: | |
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Keywords: | 97 60 Lf 04 70 Dy |
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