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Title: Does the growth rate of structure follow general relativity?
Plain: In general relativity the rate at which clumps grow follows directly from the expansion history. Measuring both separately tests whether gravity on cosmic scales is the same as in the solar system.
Precise: Measure the growth index $\gamma$ in $f(z) = \Omega_m(z)^\gamma$, where f = dln(delta)/dln(a), over $0 < z < 2$ from redshift-space distortions, peculiar velocities and lensing; general relativity with LCDM gives $\gamma \sim 0.55$. An answer is $\gamma$ with uncertainty below 0.02 and a test of its redshift dependence.
Settled by: DESI and Euclid redshift-space distortions combined with Rubin weak lensing and peculiar-velocity surveys.
Kind: well-posed
Answer type: value
References: (empty)
Literature status: open
Status note: (empty)
Posed since: (empty)