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Events on Thursday, January 30th, 2020

R. G. Herb Condensed Matter Seminar
Nanomechanical resonators for quantum optomechanics and precision metrology
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Robinjeet Singh , Joint Quantum Institute NIST (Gaithersburg) and the University of Maryland
Abstract: Nanomechanical resonators serve as excellent candidates for high precision sensing and transduction, owing to their high mechanical quality factor. Applications include coherent frequency conversion for quantum networks, measurement below the Standard Quantum Limit, and precision metrology for quantities such as temperature and pressure. Our work focuses on designing, fabricating, and optically probing nanomechanical resonators made out of various insulator and semiconductor materials for applications including quantum metrology and force sensing, optical trapping of mechanical states, and efficient electro-optic transduction of information with potential application in superconducting quantum computing.
Host: Saffman
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Cosmology Journal Club
Time: 12:00 pm
Place: 5242 Chamberlin Hall
We discuss papers from 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 ( and Santanu Das (
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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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