Tension and constraints on modified gravity parametrizations of $G_{\text{eff}}(z)$ from growth rate and Planck data

Abstract

We construct an updated and extended compilation of growth rate data consisting of 34 points and including corrections for model dependence. In order to maximize the independence of the datapoints we also construct a subsample of this compilation (`Gold' growth dataset) which consists of 18 datapoints. We test the consistency of this dataset with the best fit Planck15/$\Lambda$CDM parameters in the context of General Relativity (GR) using the evolution equation for the growth factor $\delta (a)$ with a $w$CDM background. We find tension at the $\sim 3\sigma$ level between the best fit parameters $w$ (the dark energy equation of state), ${\Omega }_{0m}$ (the matter density parameter) and ${\sigma }_8$ (the matter power spectrum normalization on scales $8h^{-1}$Mpc) and the corresponding Planck15/$\Lambda$CDM parameters. We show that the tension disappears if we allow for evolution of the effective Newton's constant, parametrized as $G_{eff}(a)/G_N=1+g_a(1-a{)}^n-g_a(1-a{)}^{2n}$ with $n\ge 2$ where $g_a$, $n$ are parameters of the model, $a$ is the scale factor and $z=1/a-1$ is the redshift. This parametrization satisfies three criteria: a. $G_{eff}>0$, b. Consistency with Big Bang Nucleosynthesis ($G_{eff}(a\ll 1)/G_N=1$), c. Consistency with solar system tests ($G_{eff}(a=1)/G_N=1$ and $G_{eff}^{\prime }(a=1)/G_N=0$). We show that the best fit form of $G_{eff}(z)$ obtained from the growth data corresponds to weakening gravity at recent redshifts (decreasing function of $z$) and we demonstrate that this behavior is not consistent with any scalar-tensor Lagrangian with a real scalar field. Finally, we use MGCAMB to find the best fit $G_{eff}(z)$ obtained from the Planck CMB power spectrum on large angular scales and show that it is a mildly increasing function of $z$, in $3\sigma$ tension with the corresponding decreasing best fit $G_{eff}(z)$ obtained from the growth data.

19 pages, 10 Figures. CMB lensing analysis included (two new Figures, Fig.8 and Fig. 9). Accepted in Phys. Rev. D (to appear). The updated numerical analysis files used for the production of the figures may be found at http://leandros.physics.uoi.gr/growth-tension/

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