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14:00 Saurabh Bansal (University of Notre Dame)
Title: Hidden Naturalness in the Light of Cosmological Data
Abstract: Hidden naturalness offers an exciting framework for alleviating the Higgs hierarchy problem. But because the models within this framework face few constraints from collider searches, there is strong motivation to study their cosmological signatures, an area that has remained mostly unexplored. One of the simplest models that can be studied in this framework is the mirror twin Higgs (MTH) model, a model that contains a near-mirror copy of the SM. Cosmologically, the MTH model is quite complex, containing new sources of free-streaming radiation, interacting radiation, and interacting dark matter. In this talk I will discuss how cosmological datasets, including the CMB temperature and polarization power spectra as measured by the Planck collaboration, constrain the parameter space of the MTH model. In addition, I will also show how this model may help in ameliorating the tensions in the cosmological datasets, specifically those related to the sigma8 and H0 measurements.
14:30 Sarah Schon (Perimeter Institute / Queens University)
Title: Galactic Center Gas Clouds as Dark Matter Detectors
Abstract: Atomic hydrogen gas clouds originating from the Galactic Center offer a novel way to test dark matter phenomenology. By exploiting the inefficient gas cooling rates at low temperatures, bounds for various interactions between dark and Standard Model matter can be set. We demonstrate this new method and present limits for a number of dark matter models including ultra-light dark photons and super-heavy candidates.