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Investigating the possibility of a turning point in the dark energy equation of state

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Abstract

We investigate a second order parabolic parametrization, w(a) = w t + w a (a t − a)2, which is a direct characterization of a possible turning in w. The cosmological consequence of this parametrization is explored by using the observational data of the SNLS3 type Ia supernovae sample, the CMB measurements from WMAP9 and Planck, the Hubble parameter measurement from HST, and the baryon acoustic oscillation (BAO) measurements from 6dFGS, BOSS DR11 and improved WiggleZ. We found the existence of a turning point in w at a ∼ 0.7 is favored at 1σ CL. In the epoch 0.55 < a < 0.9, w < −1 is favored at 1σ CL, and this significance increases near a = 0.8, reaching a 2σ CL. The parabolic parametrization achieve equivalent performance to the ΛCDM and Chevallier-Polarski-Linder (CPL) models when the Akaike information criterion was used to assess them. Our analysis shows the value of considering high order parametrizations when studying the cosmological constraints on w.

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Authors and Affiliations

  1. State Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, Beijing, 100190, China

    YaZhou Hu, Miao Li & ZhenHui Zhang

  2. Kavli Institute for Theoretical Physics China, Chinese Academy of Sciences, Beijing, 100190, China

    YaZhou Hu & ZhenHui Zhang

  3. School of Astronomy and Space Science, Sun Yat-Sen University, Guangzhou, 510275, China

    Miao Li

  4. Korea Institute for Advanced Study, Hoegiro 87, Dongdaemun-Gu, Seoul, 130-722, Korea

    XiaoDong Li

Authors
  1. YaZhou Hu
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  2. Miao Li
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  3. XiaoDong Li
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  4. ZhenHui Zhang
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Correspondence to XiaoDong Li.

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Contributed by LI Miao (Associate Editor)

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Hu, Y., Li, M., Li, X. et al. Investigating the possibility of a turning point in the dark energy equation of state. Sci. China Phys. Mech. Astron. 57, 1607–1612 (2014). https://doi.org/10.1007/s11433-014-5497-y

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  • DOI: https://doi.org/10.1007/s11433-014-5497-y

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