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We reexamine interactions between the dark sectors of cosmology, with a focuson robust constraints that can be obtained using only mildly nonlinear scales.While it is well known that couplings between dark matter and dark energy canbe constrained to the percent level when including the full range of scalesprobed by future optical surveys, calibrating matter power spectrum emulatorsto all possible choices of potentials and couplings requires manycomputationally expensive n-body simulations. Here we show that lensing andclustering of galaxies in combination with the Cosmic Microwave Background(CMB) is capable of probing the dark sector coupling to the few percent levelfor a given class of models, using only linear and quasi-linear Fourier modes.These scales can, in principle, be described by semi-analytical techniques suchas the effective field theory of large-scale structure.

Finding structure in the dark: coupled dark energy, weak lensing, and the mildly nonlinear regime