The first constraint from SDSS galaxy-galaxy weak lensing measurements on interacting dark energy models

Understand

We combine constraints from linear and nonlinear scales, for the first time, to study the interaction between dark matter and dark energy.

• We devise a novel N-body simulation pipeline for cosmological models beyond $\Lambda$CDM.
• This pipeline is fully self-consistent and opens a new window to study the nonlinear structure formation in general phenomenological interacting dark energy models.
• By comparing our simulation results with the SDSS galaxy-galaxy weak lensing measurements, we are able to constrain the strength of interaction between dark energy and dark matter.