Letter

Science China Physics, Mechanics and Astronomy

, Volume 55, Issue 7, pp 1330-1334

Dark energy and fate of the Universe

  • XiaoDong LiAffiliated withDepartment of Modern Physics, University of Science and Technology of ChinaInstitute of Theoretical Physics, Chinese Academy of Sciences
  • , Shuang WangAffiliated withDepartment of Modern Physics, University of Science and Technology of ChinaInstitute of Theoretical Physics, Chinese Academy of Sciences
  • , QingGuo HuangAffiliated withInstitute of Theoretical Physics, Chinese Academy of SciencesKey Laboratory of Frontiers in Theoretical Physics, Chinese Academy of Sciences
  • , Xin ZhangAffiliated withDepartment of Physics, College of Sciences, Northeastern UniversityCenter for High Energy Physics, Peking University Email author 
  • , Miao LiAffiliated withInstitute of Theoretical Physics, Chinese Academy of SciencesKey Laboratory of Frontiers in Theoretical Physics, Chinese Academy of Sciences

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Abstract

We explore the ultimate fate of the Universe by using a divergence-free parametrization for dark energy w(z)=w 0+w a [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