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Events at Physics

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Events on Thursday, September 24th, 2015

Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:15 pm
Place: 5242 Chamberlin Hall
Abstract: Please visit the following link for more details:
    http://cmb.physics.wisc.edu/journal/index.html
Please 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 Le Zhang (lzhang263@wisc.edu)
Host: Peter Timbie
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Astronomy Colloquium
New Views of Black Hole Disk Winds
Time: 3:45 pm
Place: 4421 Sterling Hall
Speaker: Jon Miller, University of MI
Abstract: High-resolution X-ray spectroscopy has been central to revealing the nature of X-ray winds from accreting massive black holes. These winds may ultimately have important effects on the evolution of host galaxies. However, early studies with Chandra may have given a partially skewed view of the radii at which such winds originate, and the mechanisms by which they are driven. With an eye toward the coming Astro-H era, I will briefly review past results, and then highlight some new and emerging views of black hole disk winds. Where possible, I will draw analogies between parallel investigations in accreting stellar-mass black holes. Overall, new results suggest that disk winds may originate closer to the black hole, and carry much more
mass and power than previously appreciated.
Host: Prof Sebastian Heinz
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R. G. Herb Condensed Matter Seminar
Phases of Complex Oxides Driven Out of Equilibrium
Time: 4:30 pm
Place: 5310 Chamberlin Hall
Speaker: John Freeland , Argonne National Lab
Abstract: Functional oxides based on the transition metal series display a wide spectrum of remarkable electronic properties including magnetism, superconductivity and metal-insulator transitions, which offer potential important properties for practical applications including colossal responses to external fields, switchable conductivity, and efficient energy conversion. However, under these conditions for application, these systems tend to be driven far away from the equilibrium ground-state. In order to harness these materials for the future, one of the grand challenges is to understand how to map the non-equilbrium phase space both to seek conditions where new states emerge but also as a basis for the design of materials that will help meet the energy needs of the future. In this talk, I will touch on recent work ranging from optical excitation[1,2] to catalysis[3,4] to watching how materials grow[5] as an introduction to how some of the forefront X-ray tools are helping us to scratch the surface of this problem.<br>
Work at Argonne is supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.<br>
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[1] H. Wen et al. Phys. Rev. Lett. 110, 37601 (2013).<br>
[2] H. Wen et al. Physical Review B 88,165424 (2013).<br>
[3] H. Jeen et al. Nature Materials 12, 1056 (2013).<br>
[4] S.-.H Chang et al. Nature Communications 5, 4191 (2014).<br>
[5] J.H. Lee et al. Nature Materials 13, 879 (2014).<br>
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Host: McDermott
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Graduate Introductory Seminar
WIPAC: IceCube, HAWC, CTA, ARA
Time: 4:30 pm
Place: 5280 Chamberlin Hall
Speaker: Halzen, Hanson, Karle, Vandenbroucke, Westerhoff
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