| Abstract : | Understanding the formation and evolution of non-linear structure in the universe can shed light on some of the most fundamental questions in Cosmology. In this talk I will focus on how the halo density profile can be used to understand halo and galaxy co-evolution, the nature of gravity and dark matter. The splashback radius of halos has emerged as a probe of physics in the interface of galaxy formation and Cosmology. It forms the edge of the orbiting region of a halo and is sensitive to its evolution history and also the underlying cosmological model. I will discuss what observations of massive clusters and the distribution of galaxies and dark matter within them can teach us about some open problems in Cosmology and structure formation in the light of our understanding of the splashback radius.
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