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Events on Thursday, May 2nd, 2019

Cosmology Journal Club
Time: 12:00 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
Feel free to bring your lunch!
If you have questions or comments about this journal club, would like to propose a topic or volunteer to introduce a paper, please email Ross Cawthon (cawthon@wisc.edu) and Santanu Das (sdas33@wisc.edu).
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Astronomy Colloquium
"Implications of gravitational wave detections for stellar astrophysics"
Time: 3:30 pm
Place: 4421 Sterling Hall, Coffee and cookies 3:30 PM, Talk begins 3:45 PM
Speaker: Lidia Oskinova, University of Potsdam
Abstract: Stars with masses much higher than our Sun end their short lives in a gravitational collapse, leaving neutron stars and black holes behind. The detections of gravitational waves (GW) brought massive star astrophysics into the new era. A comprehensive understanding of massive star lives and deaths is urgently required to fully unleash the power of multi-messenger astronomy. In this talk I will briefly review what we presently know about massive stars, and highlight the key problems in our current understanding of neutron star and black hole progenitors. I will present our recent results from the study of massive stars in the SMC galaxy, which suggest that evolutionary paths of very massive stars at low and high metallicities are significantly different . Finally, I will discuss what the recent GW observations already have told us about massive stars, and how the different scenarios for the GW progenitors could be tested by massive star astrophysics.
Host: Professor Emeritus Jay Gallagher
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R. G. Herb Condensed Matter Seminar
Please note special time!
Optical and transport properties of metals with nontrivial band geometry
Time: 4:00 pm
Place: 5310 Chamberlin Hall
Speaker: Dima Pesin , University of Virginia
Abstract: I will describe how the geometry of the band structure of metals manifests itself in their optical and transport properties. I particular, I will show that the natural optical activity of metals, equivalent to the so-called dynamic chiral magnetic effect, stems from the intrinsic magnetic moments of quasiparticles, and demonstrate that these magnetic moments can be of both intrinsic and extrinsic origin. I will also discuss optical Hall response of chiral crystals in the presence of a DC transport current – the gyrotropic Hall effect – and show that it is related to the Berry curvature dipole. The latter fact makes the gyrotropic Hall effect a diagnostic tool for topological properties of three-dimensional chiral metals.
Host: Alex Levchenko
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