Testing the effect of on tension using a Gaussian Process method
arXiv:1911.12076 · doi:10.1093/mnras/staa3894
Abstract
Using the redshift space distortion (RSD) data, the tension is studied utilizing a parameterization of growth rate . Here, is derived from the expansion history which is reconstructed from the observational Hubble data applying the Gaussian Process method. It is found that different priors of have great influences on the evolution curve of and the constraint of . When using a larger prior, the low redshifts deviate significantly from that of the CDM model, which indicates that a dark energy model different from the cosmological constant can help to relax the tension problem. The tension between our best-fit values of and that of the \textit{Planck} 2018 CDM (PLA) will disappear (less than ) when taking a prior for obtained from PLA. Moreover, the tension exceeds level when applying the prior km/s/Mpc resulted from the Hubble Space Telescope photometry. By comparing the planes of our method with the results from KV450+DES-Y1, we find that using our method and applying the RSD data may be helpful to break the parameter degeneracies.
arXiv comment13 pages, 10 figures, accepted for publication by MNRAS
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