Science China Physics, Mechanics and Astronomy

, Volume 55, Issue 7, pp 1330–1334 | Cite as

Dark energy and fate of the Universe

  • XiaoDong Li
  • Shuang Wang
  • QingGuo Huang
  • Xin Zhang
  • Miao Li
Letter

Abstract

We explore the ultimate fate of the Universe by using a divergence-free parametrization for dark energy w(z)=w0+wa [ln(2 + z) / (1 + z) − ln 2]. Unlike the Chevallier-Polarski-Linder parametrization, this parametrization has well behaved, bounded behavior for both high redshifts and negative redshifts, and thus can genuinely cover many theoretical dark energy models. After constraining the parameter space of this parametrization by using the current cosmological observations, we find that, at the 95.4% confidence level, our Universe can still exist at least 16.7 Gyr before it ends in a big rip. Moreover, for the phantom energy dominated Universe, we find that a gravitationally bound system will be destroyed at a time \({{t \simeq P\sqrt {2\left| {1 + 3w( - 1)} \right|} } \mathord{\left/ {\vphantom {{t \simeq P\sqrt {2\left| {1 + 3w( - 1)} \right|} } {\left[ {6\pi \left| {1 + w( - 1)} \right|} \right]}}} \right. \kern-\nulldelimiterspace} {\left[ {6\pi \left| {1 + w( - 1)} \right|} \right]}}\), where P is the period of a circular orbit around this system, before the big rip.

Keywords

dark energy dynamical evolution fate of the Universe 

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2012

Authors and Affiliations

  • XiaoDong Li
    • 1
    • 2
  • Shuang Wang
    • 1
    • 2
  • QingGuo Huang
    • 2
    • 3
  • Xin Zhang
    • 4
    • 5
  • Miao Li
    • 2
    • 3
  1. 1.Department of Modern PhysicsUniversity of Science and Technology of ChinaHefeiChina
  2. 2.Institute of Theoretical PhysicsChinese Academy of SciencesBeijingChina
  3. 3.Key Laboratory of Frontiers in Theoretical PhysicsChinese Academy of SciencesBeijingChina
  4. 4.Department of Physics, College of SciencesNortheastern UniversityShenyangChina
  5. 5.Center for High Energy PhysicsPeking UniversityBeijingChina

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