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Events at Physics

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Events on Tuesday, January 19th, 2016

Chaos & Complex Systems Seminar
The Universe: Yesterday, today, and tomorrow
Time: 12:05 pm
Place: 4274 Chamberlin Hall
Speaker: Ed Churchwell, UW Department of Astronomy
Abstract: Based on the current Standard Model, we will take an excursion in time to examine the properties of the Universe from just after the Big Bang to the present and into the future. This will begin with a discussion of the primary observations that underpin the Standard Model and the basic physical principles that connect the observations to the current model. We will end with the current best values for the Standard Model and their implications for the future evolution of the universe.<br>
Host: Sprott
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Theory Seminar (High Energy/Cosmology)
Discrete Abelian symmetries in the MSSM and its extensions
Time: 3:30 pm
Place: 5280 Chamberlin Hall
Speaker: Volodymyr Takhistov, University of California, Irvine
Abstract: Discrete symmetries play a major role in particle physics. With supersymmetry being one of the most well motivated extensions of the Standard Model, discrete symmetries have been employed in the context of minimal supersymmetric Standard Model (MSSM) to resolve various issues such as fast proton decay and the mu-problem. We systematically explore anomaly free and phenomenologically viable discrete Abelian (R-)symmetries for the MSSM, considering both R-parity conserving as well as violating (RPV) scenarios. Among the new solutions that we obtain, some RPV models are found to be compatible with the Pati-Salam unification and some favor Dirac neutrino mass. Additionally, we present a novel general algorithm for identifying a maximal discrete symmetry for a given particle content and a set of constraints.
We describe how such discrete symmetries may be used as a basis for construction of more complete models, which also address baryogenesis and flavor sector. Since proton decay is one of the most severe constraints for such models, we will briefly mention some of the novel proton decay searches at the Super-Kamiokande experiment. Finally, we will also show how the lack of stabilizing discrete Z3 symmetry in the context of lepton-flavored dark matter (DM) models can lead to interesting DM decay channels.
Host: Yang Bai
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