大学物理 ›› 2018, Vol. 37 ›› Issue (5): 49-51.doi: 10.16854 /j.cnki.1000-0712.170546

• 教学讨论 • 上一篇    下一篇

遥远星体在太阳引力作用下形成的爱因斯坦环

赵凡,贺锋,任文辉   

  1. 1.湖南农业大学东方科技学院,湖南长沙410128; 2. 湖南科技大学物理与电子科学技术学院,湖南湘潭411201; 3. 湖南农业大学理学院,湖南长沙410128
  • 收稿日期:2017-09-28 修回日期:2017-12-14 出版日期:2018-05-20 发布日期:2018-05-20
  • 作者简介:赵凡(1984—),男,湖南常德人,湖南农业大学东方科技学院,硕士,主要从事理论物理、神经生物物理的

Einstein’s ring of a distant star formed by the sun’s gravity

ZHAO Fan2,HE Feng2,REN Wen-hui3   

  1. 1. Orient Science and Technology College,Hunan Agricultural University,Changsha,Hunan 410128,China; 2. College of Physics and Electronic Science,Hunan University of Science and Technology,Xiangtan,Hunan 411201,China; 3. College of Science,Hunan Agricultural University,Changsha,Hunan 410128,China
  • Received:2017-09-28 Revised:2017-12-14 Online:2018-05-20 Published:2018-05-20

摘要: 当遥远星体,太阳以及观测者在一条直线上时,由于星光在太阳引力场中的偏折效应将形成爱因斯坦环.忽略太阳 自转,其外部引力场可用史瓦西度规描述.运用椭圆积分严格地求出零测地线的精确解,并从精确解反解出观测者的径向坐 标.从零测地线的精确解可计算出观测者与太阳的距离必须大于或等于547.7 天文单位才能观测到星光在太阳引力作用下产 生的爱因斯坦环,但是爱因斯坦环几乎和太阳边缘重叠在一起,目前的技术难以分辨.

关键词: 零测地线, 严格解, 爱因斯坦环

Abstract: When a distant star,the sun and the observer are in a line,the Einstein’s ring can be viewed. Ignoring rotation of the sun,the gravitational field of solar system is described by Schwarzschild metric and then the null geodesic equation is solved exactly by elliptic integral.It must be apart from the sun at least 547.7 AU to observe the Einstein’s ring. However,the diameter of Einstein’s ring and the sun’s edge almost overlap each other so that it is very difficult to distinguish them under current technology.

Key words: null geodesic, exact solution, Einstein’s ring