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A generic prediction of the standard cosmology, based on general relativity(GR), dark matter and the cosmological constant (and more generally, smoothdark energy), is that, the two gravitational potentials describing the spatialand temporal scalar perturbations of the universe are equivalent. Modificationsin GR or dark energy clustering in general violate this relation. Thus thisratio serves as a smoking gun of the dark universe. We propose a method toextract this ratio at various cosmological scales and redshifts from a set ofmeasurements, in a model independent way. The ratio measured by future surveyshas strong discriminating power for a variety of dark universe scenarios.

Weighing the spatial and temporal fluctuations of the dark universe