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Events on Thursday, January 30th, 2020

R. G. Herb Condensed Matter Seminar
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Robinjeet Singh , Joint Quantum Institute NIST (Gaithersburg) and the University of Maryland
Abstract: TBD
Host: Saffman
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Cosmology Journal Club
Time: 12:00 pm
Place: 5242 Chamberlin Hall
Abstract: http://cmb.physics.wisc.edu/journal/index.html
We discuss papers from arxiv.org related to cosmology each week. All are welcome and feel free to bring your lunch. If there is a paper you would like to present, or have questions or comments, please email Ross Cawthon (cawthon@wisc.edu) and Santanu Das (sdas33@wisc.edu).
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Astronomy Colloquium
"Some Interesting issues in Galactic Dynamics"
Time: 3:30 pm
Place: 4421 Sterling Hall, Coffee and cookies 3:30 PM, Talk begins 3:45 PM
Speaker: Professor Elena D'onghia, UW Madison Astronomy Department
Abstract: The Gaia satellite is currently mapping the phase-space of a few million stars in the solar neighborhood showing time-varying phenomena. About 350,000 stars within 200 pc of the Sun are identified in streams, bundles of stars that move together in the same direction with a velocity that is distinct from neighboring stars. I will present a set of N-body simulations of the Milky Way disk that shows the role of a long stellar bar and spiral arms in understanding the complex kinematics of the solar vicinity. Finally, the passage of Sagittarius dwarf galaxy induces rapid time-variations in the potential that lead to a significant bias of the Oort limit through the Jeans modeling. This calls for the development of non-equilibrium methods to estimate the dynamical matter density locally and in the outer disk.
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