Probing dynamics of dark energy with latest observations

Yue Cheng Zhang; Han Yu Zhang; Dan Dan Wang; Yang Han Qi; Yu Ting Wang; Gong Bo Zhao

doi:10.1088/1674-4527/17/6/50

Probing dynamics of dark energy with latest observations

Yue Cheng Zhang, Han Yu Zhang, Dan Dan Wang, Yang Han Qi, Yu Ting Wang, Gong Bo Zhao^*

^*Corresponding author for this work

Institute of Cosmology & Gravitation

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Abstract

We examine the validity of the ΛCDM model and probe the dynamics of dark energy with the latest astronomical observations. Using the Om(z) diagnosis, we find that various kinds of observational data are in tension within the ΛCDM framework. We then allow for dynamics of dark energy and investigate the constraint on dark energy parameters. We find that for two different kinds of parametrisations of the equation of state parameter w, a combination of current data mildly favours an evolving w, although the significance is not sufficient for it to be supported by Bayesian evidence. A forecast of the DESI survey shows that the dynamics of dark energy could be detected at the 7σ confidence level and would be decisively supported by Bayesian evidence, if the best-fit model of w derived from current data is the true model.

Original language	English
Article number	050
Journal	Research in Astronomy and Astrophysics
Volume	17
Issue number	6
DOIs	https://doi.org/10.1088/1674-4527/17/6/50
Publication status	Published - 1 Jun 2017

Keywords

cosmology
dark energy
large scale structure

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10.1088/1674-4527/17/6/50

1703.08293_postprint
This is an author-created, un-copyedited version of an article accepted for publication/published in Research in Astronomy and Astrophysics. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at: https://doi.org/10.1088/1674-4527/17/6/50.
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abstract = "We examine the validity of the ΛCDM model and probe the dynamics of dark energy with the latest astronomical observations. Using the Om(z) diagnosis, we find that various kinds of observational data are in tension within the ΛCDM framework. We then allow for dynamics of dark energy and investigate the constraint on dark energy parameters. We find that for two different kinds of parametrisations of the equation of state parameter w, a combination of current data mildly favours an evolving w, although the significance is not sufficient for it to be supported by Bayesian evidence. A forecast of the DESI survey shows that the dynamics of dark energy could be detected at the 7σ confidence level and would be decisively supported by Bayesian evidence, if the best-fit model of w derived from current data is the true model.",

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AU - Qi, Yang Han

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AU - Zhao, Gong Bo

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Probing dynamics of dark energy with latest observations

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