Dynamics of quintom and hessence energies in loop quantum cosmology

Hao Wei and Shuang Nan Zhang
Phys. Rev. D 76, 063005 – Published 12 September 2007

Abstract

In the present work, we investigate the universe dominated by quintom or hessence energies in loop quantum cosmology (LQC). Interestingly enough, we find that there are some stable attractors in these two cases. In the case of quintom, all stable attractors have the feature of decelerated expansion. In the case of hessence, most of stable attractors have the feature of decelerated expansion while one stable attractor can have decelerated or accelerated expansion depend on the model parameter. In all cases, the equation-of-state parameter (EoS) of all stable attractors are larger than 1 and there is no singularity in the finite future. These results are different from the dynamics of phantom in LQC, or the ones of phantom, quintom, and hessence in classical Einstein gravity.

  • Received 30 May 2007

DOI:https://doi.org/10.1103/PhysRevD.76.063005

©2007 American Physical Society

Authors & Affiliations

Hao Wei*

  • Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084, China

Shuang Nan Zhang

  • Department of Physics and Tsinghua Center for Astrophysics, Tsinghua University, Beijing 100084, China
  • Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • Physics Department, University of Alabama in Huntsville, Huntsville, Alabama 35899, USA

  • *haowei@mail.tsinghua.edu.cn

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Vol. 76, Iss. 6 — 15 September 2007

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