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Events at Physics

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Events During the Week of January 26th through February 2nd, 2020

Monday, January 27th, 2020

No events scheduled

Tuesday, January 28th, 2020

Chaos & Complex Systems Seminar
A conditional Gaussian framework for assimilating and predicting complex nonlinear turbulent dynamical systems
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Nan Chen, UW Department of Mathematics
Abstract: A conditional Gaussian nonlinear and non-Gaussian framework is developed and is applied to study data assimilation, uncertainty quantification and prediction of complex nonlinear turbulent dynamical systems. The talk will contain the following topics: recovering turbulent ocean flows, predicting non-Gaussian atmosphere phenomena including extreme events, solving the time evolution of high-dimensional probability density function, parameter estimation and recovering the hidden states in complex systems.
Host: Clint Sprott
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Chaos & Complex Systems Seminar
A conditional Gaussian framework for assimilating and predicting complex nonlinear turbulent dynamical systems
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Nan Chen, UW Department of Mathematics
Abstract: A conditional Gaussian nonlinear and non-Gaussian framework is developed and is applied to study data assimilation, uncertainty quantification and prediction of complex nonlinear turbulent dynamical systems. The talk will contain the following topics: recovering turbulent ocean flows, predicting non-Gaussian atmosphere phenomena including extreme events, solving the time evolution of high-dimensional probability density function, parameter estimation and recovering the hidden states in complex systems.
Host: Clint Sprott
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Wednesday, January 29th, 2020

Department Meeting
Time: 12:15 pm
Place: B343 Sterling Hall
Speaker: Sridhara Dasu, Department Chair
Host: Sridhara Dasu
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Atomic Physics Seminar
TBD
Time: 1:00 pm
Place: 5310 Chamberlin Hall
Speaker: William Terrano, Princeton
Abstract: TBD
Host: Thrasher
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Thursday, January 30th, 2020

R. G. Herb Condensed Matter Seminar
TBD
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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Friday, January 31st, 2020

Physics Department Colloquium
Magnetic reconnection: where are we and where are we going?
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: Michael Hesse, University of Bergen
Abstract: Magnetic reconnection is the engine behind the often-explosive conversion of magnetic energy to the energy of particles. Due to this conversion as well as its plasma transport properties, it powers solar eruptions, magnetospheric substorms and storms and the aurora. Further away, in astrophysical systems, it is believed to be tied to gamma ray bursts, accretion disks, and other energy release processes, while it can cause violent disruptions in fusion machines. Due to the extremely small scale size of its central diffusion region, the basic mechanisms behind reconnection have been elusive for many decades. Courtesy of NASA’s Magnetospheric Multiscale mission this has changed in the last three years. This presentation will start with a summary of our present knowledge and present an outlook to open science questions and applications of the new knowledge.
Host: Jan Egedal
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