Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8186721 | Physics Letters B | 2018 | 6 Pages |
Abstract
We make a consistency test for the general relativity (GR) through measuring the growth index γ in a universe with massive (sterile/active) neutrinos. We employ the redshift space distortion measurements to do the analysis. To constrain other cosmological parameters, we also use other cosmological measurements, including the Planck 2015 cosmic microwave background temperature and polarization data, the baryon acoustic oscillation data, the type Ia supernova JLA data, the weak lensing galaxy shear data, and the Planck 2015 lensing data. In a universe with massive sterile neutrinos, we obtain γ=0.624â0.050+0.055, with the tension with the GR prediction γ=0.55 at the 1.48Ï level, showing that the consideration of sterile neutrinos still cannot make the true measurement of γ be well consistent with the GR prediction. In a universe with massive active neutrinos, we obtain γ=0.663±0.045 for the normal hierarchy case, γ=0.661â0.050+0.044 for the degenerate hierarchy case, and γ=0.668â0.051+0.045 for the inverted hierarchy case, with the tensions with GR all at beyond the 2Ï level. We find that the consideration of massive active neutrinos (no matter what mass hierarchy is considered) almost does not influence the measurement of the growth index γ.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Nuclear and High Energy Physics
Authors
Ming-Ming Zhao, Jing-Fei Zhang, Xin Zhang,