Physics PAN Seminar by Prof. David Curtin (University of Toronto) on Cosmology and Astrophysics of Dark Complexity

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Date: October 16, 2020
Time: 3:30 p.m. - 4:30 p.m.
Location: on zoom
Category: Seminar

Title: Cosmology and Astrophysics of Dark Complexity

Dark matter could be part of a complex dark sector that is distinct from but in some ways analogous to the visible sector. This is motivated, for example, by the Twin Higgs model, which solves the little Hierarchy Problem without colored top partners, but also generically by analogy to the richness and non-minimality of the Standard Model. The Twin Higgs model provides a useful benchmark to explore the vast signature space of dark complexity in a theoretically motivated framework. Dark complexity is the flipside of hidden valleys phenomenology at colliders, and depending on model details, the phenomenology looks very different: either spectacular long-lived particle signals at colliders, or a plethora of unusual cosmological and astrophysical signatures via the existence of a predictive hidden sector. I will focus on the latter possibility, and describe how the asymmetrically reheated Twin Higgs realization of dark complexity predicts correlated signals in the CMB, Large Scale Structure, and direct detection searches, as well as higgs precision measurements at colliders. The existence of complex interacting DM relics also predicts highly exotic stellar objects called Mirror Stars with signatures that are remarkably robust with respect to theoretical uncertainties in the hidden sector. Mirror stars could be the first and highly spectacular harbinger of dark complexity and may show up in optical and X-ray searches, LIGO gravitational wave signals, or microlensing surveys. This provides a vivid, multidisciplinary example of the complementarity between collider experiments and cosmological/astrophysical observations to discover the solution to fundamental mysteries like dark matter and the hierarchy problem.


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Meeting ID: 944 0805 2160
Passcode: 124700
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Raghav Kunnawalkam Elayavalli


October 2020