A bound system in the expanding universe with modified holographic Ricci dark energy and dark matter

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• 作者：En-Kun Li (1)
  Yu Zhang (1)
  Jin-Ling Geng (1)
  Peng-Fei Duan (2)
  
  1. Faculty of Science ; Kunming University of Science and Technology ; Kunming ; Yunnan ; 650500 ; People鈥檚 Republic of China
  2. City College ; Kunming University of Science and Technology ; Kunming ; Yunnan ; 650051 ; People鈥檚 Republic of China
  
• 关键词：Bound system ; Expanding background ; Modified holographic Ricci dark energy
• 刊名：Astrophysics and Space Science
• 出版年：2015
• 出版时间：January 2015
• 年：2015
• 卷：355
• 期：1
• 页码：187-193
• 全文大小：419 KB
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• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Astronomy
  
• 出版者：Springer Netherlands
• ISSN：1572-946X

文摘

The evolution of a bound system in the expanding background has been investigated in this paper. The background is described by a FRW universe with the modified holographic dark energy model, whose equation of state parameter changes with time and can cross the phantom boundary. To study the evolution of the bound system, an interpolating metric is considered, and on this basis the geodesics of a test particle are given. The equation of motion and the effective potential are also derived from the geodesics. By studying the effective potential and the evolution of the radius of a test particle in the bound system of the Milky Way galaxy, we have found that the galaxy would go through three stages: expands from a singular point; stays in a discoid for a period of time; big rip in the future. With the help of analyzing the critical angular momentum, we find that the test particle needs less angular momentum to escape from the center mass as time passes.