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Chinese Physics C> 2018, Vol. 42> Issue(9) : 095101 DOI: 10.1088/1674-1137/42/9/095101

Local probes strongly favor ∧CDM against power-law and Rh=ct universe

  • 1.

      Department of Physics, Chongqing University, Chongqing 401331, China

  • 2.

     Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

  • 3.

     University of Chinese Academy of Sciences, Beijing 100049, China

  • We constrain three cosmological models-the concordance cold dark matter plus cosmological constant (∧CDM) model, the power-law (PL) model, and the Rh=ct model-using the available local probes, which include the JLA compilation of type-Ia supernovae (SNe Ia), the direct measurement of the Hubble constant (H(z)), and the baryon acoustic oscillations (BAO). For the ∧CDM model, we consider two different cases, i.e. zero and non-zero spatial curvature. We find that by using the JLA alone, the ∧CDM and PL models are indistinguishable, but the Rh=ct model is strongly disfavored. If we combine JLA+H(z), the ∧CDM model is strongly favored over the other two models. The combination of all three datasets supports ∧CDM as the best model. We also use the low-redshift (z<0.2) data to constrain the deceleration parameter using the cosmography method, and find that only the ∧CDM model is consistent with cosmography. However, there is no strong evidence to distinguish between flat and non-flat ∧CDM models by using the local data alone.
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Hai-Nan Lin, Xin Li and Yu Sang. Local probes strongly favor ∧CDM against power-law and Rh=ct universe[J]. Chinese Physics C, 2018, 42(9): 095101. doi: 10.1088/1674-1137/42/9/095101
Hai-Nan Lin, Xin Li and Yu Sang. Local probes strongly favor ∧CDM against power-law and Rh=ct universe[J]. Chinese Physics C, 2018, 42(9): 095101.  doi: 10.1088/1674-1137/42/9/095101 shu
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Received: 2018-04-08
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    Supported by National Natural Science Fund of China (11603005, 11775038, 11647307, 11675182, 11690022)

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Local probes strongly favor ∧CDM against power-law and Rh=ct universe

    Corresponding author: Hai-Nan Lin,
    Corresponding author: Xin Li,
    Corresponding author: Yu Sang,
  • 1.  Department of Physics, Chongqing University, Chongqing 401331, China
  • 2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
  • 3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received Date: 2018-04-08
  • Available Online: 2018-09-05
Fund Project:  Supported by National Natural Science Fund of China (11603005, 11775038, 11647307, 11675182, 11690022)

Abstract: We constrain three cosmological models-the concordance cold dark matter plus cosmological constant (∧CDM) model, the power-law (PL) model, and the Rh=ct model-using the available local probes, which include the JLA compilation of type-Ia supernovae (SNe Ia), the direct measurement of the Hubble constant (H(z)), and the baryon acoustic oscillations (BAO). For the ∧CDM model, we consider two different cases, i.e. zero and non-zero spatial curvature. We find that by using the JLA alone, the ∧CDM and PL models are indistinguishable, but the Rh=ct model is strongly disfavored. If we combine JLA+H(z), the ∧CDM model is strongly favored over the other two models. The combination of all three datasets supports ∧CDM as the best model. We also use the low-redshift (z<0.2) data to constrain the deceleration parameter using the cosmography method, and find that only the ∧CDM model is consistent with cosmography. However, there is no strong evidence to distinguish between flat and non-flat ∧CDM models by using the local data alone.

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