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Events on Tuesday, October 27th, 2015

Chaos & Complex Systems Seminar
Cosmic rays from the simple to the complex
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Justin Vandenbroucke, UW Department of Physics
Abstract: Cosmic rays and their siblings, astrophysical gamma rays and neutrinos, are fundamentally simple objects: high energy subatomic particles. However, they arrive at Earth bearing information about some of the most energetic and enigmatic phenomena in the universe, including exploding stars, giant black holes at the center of distant galaxies, and dark matter. I will discuss recent progress and open questions, including the prospects for answering some of them with a new instrument called the Cherenkov Telescope Array. Finally, I will present the Distributed Electronic Cosmic-ray Observatory, an app and website that enable members of the public to detect cosmic rays with cell phone camera sensors.
Host: Sprott
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Theory Seminar (High Energy/Cosmology)
Z'-portal for dark mesons in the SIMP scheme
Time: 3:30 pm
Place: 5280 Chamberlin Hall
Speaker: Min-Seok Seo, Seoul National University
Abstract: Recently, it has been proposed that dark mesons with Wess-Zumino-Witten term realizes the SIMP scheme, in which dark matter relic density is determined by freeze-out of 3 -> 2 self annihilation, in a natural way. This model can be completed after considering communication between dark sector and Standard Model sector in order to prevent the dark matter over-heating. In this talk, kinetic mixing between dark U(1) and hypercharge U(1) gauge bosons is suggested as a plausible interaction satisfying such requirement. Possible ways of assigning U(1) charge are restricted by the presence of Wess-Zumino-Wittern term, so more information on dark sector can be extracted. Requirement of sufficient interaction between dark- and Standard Model sector provides lower bound of the dark photon mass and the magnitude of kinetic mixing. Several additional issues concerning the model is also visited.
Host: Amol Upadhye
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