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Holographic Λ(t)CDM model in a non-flat universe

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Abstract

The holographic Λ(t)CDM model in a non-flat universe is studied in this paper. In this model, to keep the form of the stress-energy of the vacuum required by general covariance, the holographic vacuum is enforced to exchange energy with dark matter. It is demonstrated that for the holographic model the best choice for the IR cutoff of the effective quantum field theory is the event horizon size of the universe. We derive the evolution equations of the holographic Λ(t)CDM model in a non-flat universe. We constrain the model by using the current observational data, including the 557 Union2 type Ia supernovae data, the cosmic microwave background anisotropy data from the 7-yr WMAP, and the baryon acoustic oscillation data from the SDSS. Our fit results show that the holographic Λ(t)CDM model tends to favor a spatially closed universe (the best-fit value of Ω k0 is −0.042), and the 95 % confidence level range for the spatial curvature is −0.101<Ω k0<0.040. We show that the interaction between the holographic vacuum and dark matter induces an energy flow of which the direction is first from vacuum to dark matter and then from dark matter to vacuum. Thus, the holographic Λ(t)CDM model is just a time-varying vacuum energy scenario in which the interaction between vacuum and dark matter changes sign during the expansion of the universe.

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Acknowledgements

This work was supported by the National Science Foundation of China under Grant Nos. 10705041, 10975032, 11047112 and 11175042, and by the National Ministry of Education of China under Grant Nos. NCET-09-0276, N100505001, N090305003, and N110405011.

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Authors and Affiliations

  1. Department of Physics, College of Sciences, Northeastern University, Shenyang, 110004, China

    Jing-Fei Zhang, Yang-Yang Li, Ying Liu, Sheng Zou & Xin Zhang

  2. Center for High Energy Physics, Peking University, Beijing, 100080, China

    Xin Zhang

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  1. Jing-Fei Zhang
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Correspondence to Xin Zhang.

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Zhang, JF., Li, YY., Liu, Y. et al. Holographic Λ(t)CDM model in a non-flat universe. Eur. Phys. J. C 72, 2077 (2012). https://doi.org/10.1140/epjc/s10052-012-2077-z

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