Deflection angle of light for an observer and source at finite distance from a rotating global monopole
Deflection angle of light for an observer and source at finite distance from a rotating global monopole
复制标题
距离旋转全局单极子有限距离处的观察者和光源的光偏转角
DOI：
10.1103/physrevd.99.124030
复制
发表时间：
2019
影响因子：
5
通讯作者：
Asada Hideki
中科院分区：
文献类型：
--
作者：
Ono Toshiaki;Ishihara Asahi;Asada Hideki
通过使用一种用广义光学度规改进的方法，最近讨论了在静止、轴对称和渐近平坦时空中，观察者和光源与透镜物体的有限距离处的光偏转[Ono，Ishihara，Asada，Phys. Rev. D 96，104037（2017）PRVDAQ 2470 -001010.1103/PhysRevD.96.104037]。在本文中，我们研究了这种方法的一个可能的扩展到一个渐近非平坦的时空。我们讨论一个全球性的循环。我们的光的偏转角的结果进行了比较，与最近的工作相同的时空，但限制在渐近源和观察者[Jusufiet等人，Phys. Rev. D 95，104012（2017）PRVDAQ 2470 -001010.1103/PhysRevD.95.104012]，其中他们采用了Werner提出的另一种方法，通过Randers-Finsler度量使用Nazim密切黎曼构造方法。我们证明了这两种方法在渐近远极限上给出了相同的结果。我们还得到了由于旋转的全球卫星的有限距离的偏转角的修正。在不久的将来，对Sgr A * 的观测将能够为旋转的全球大气环流模式的全球大气环流参数设定一个界限，这被解释为亏损角[rad]的界限。
By using a method improved with a generalized optical metric, the deflection of light for an observer and source at finite distance from a lens object in a stationary, axisymmetric and asymptotically flat spacetime has been recently discussed [Ono, Ishihara, Asada, Phys. Rev. D 96, 104037 (2017)PRVDAQ2470-001010.1103/PhysRevD.96.104037]. In this paper, we study a possible extension of this method to an asymptotically nonflat spacetime. We discuss a rotating global monopole. Our result of the deflection angle of light is compared with a recent work on the same spacetime but limited within the asymptotic source and observer [Jusufiet al., Phys. Rev. D 95, 104012 (2017)PRVDAQ2470-001010.1103/PhysRevD.95.104012], in which they employ another approach proposed by Werner with using the Nazim’s osculating Riemannian construction method via the Randers-Finsler metric. We show that the two different methods give the same result in the asymptotically far limit. We obtain also the corrections to the deflection angle due to the finite distance from the rotating global monopole. Near-future observations of Sgr A * will be able to put a bound on the global monopole parameterasfor a rotating global monopole model, which is interpreted as the bound on the deficit angle[rad].