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New forces interacting with visible matter are very well constrained by a plethora of experiments at different scales but very little is known about long range forces interacting with dark matter only. I will discuss the imprints of these "dark fifth forces" in cosmological observables and their possible interplay with the nature of dark matter and dark energy. I will show how the current cosmological data already constrain the dark fifth forces to be a sub-percent deviation of the dark matter gravitational interaction. I will then discuss smoking guns of dark fifth forces in the matter power spectrum and in the bispectrum that could only be seen with the forthcoming DESI and EUCLID datasets.
Since the 1960s, particle physicists have developed a variety of data analysis strategies for the goal of comparing experimental measurements to theoretical predictions. Despite their numerous successes, these techniques can seem esoteric and ad hoc, even to practitioners in the field. In this talk, I explain how many particle physics analysis tools have a natural geometric interpretation in an emergent "space" of collider events induced by the Wasserstein metric. This in turn suggests new analysis strategies to interpret point cloud data sets from collider physics and beyond.