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This Week at Physics

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Events During the Week of May 12th through May 19th, 2013

Monday, May 13th, 2013

Cosmology Journal Club
An Informal discussion about a broad variety of arXiv papers related to Cosmology
Time: 12:30 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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Tuesday, May 14th, 2013

Theory Seminar (High Energy/Cosmology)
The mu term in G2-MSSM, theoretical origin and phenomenological applications
Time: 4:00 pm
Place: 5280 Chamberlin Hall
Speaker: Ran Lu, University of Michigan
Abstract: G2-MSSM is a low energy effective model motivated by G2 compactification of M theory. I will discuss a new approach to generate the mu term in G2-MSSM using the discrete symmetry of the G2 manifold, and review the phenomenological implication with this improved understanding of the model.
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Wednesday, May 15th, 2013

Theory Seminar (High Energy/Cosmology)
Vector-like Fermions and the Electroweak Phase Transition
Time: 4:00 pm
Place: 5280 Chamberlin Hall
Speaker: Eduardo Pontón, Columbia University
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Thursday, May 16th, 2013

Theory Seminar (High Energy/Cosmology)
Dark Matter Searches Using Radio Waves and Neutrinos
Time: 11:00 am
Place: 5280 Chamberlin Hall
Speaker: Ranjan Laha, Ohio State University
Abstract: The particle nature of dark matter is one of the biggest mysteries of present day science. I will discuss some of the efforts in detecting dark matter through radio waves and neutrinos. I will first talk about the recent hint of a 130 GeV gamma-ray line from the Galactic Center in the Fermi-LAT data. I will show that current radio observations of the Galactic Center marginally constrain the interpretation of the claimed gamma lines, independent of the underlying particle physics model, for a contracted NFW profile. Radio data of the Galactic Center with existing telescopes will play an important role in confirming or ruling out the dark matter interpretation of the gamma-ray line. I will then talk about neutrinos as a probe of dark matter. Neutrinos are the best probe of TeV-scale dark matter annihilation signal and I will show that galaxy clusters are the best indirect detection target for a neutrino telescope like IceCube -- this has been recently confirmed by the IceCube collaboration. Additionally I will also show how meson decay or W decay can constrain certain models of dark matter which have been proposed recently to solve all small-scale structure problems in LambdaCDM cosmology.
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Reanalysis of the Reactor Neutrino Anomaly
Time: 2:30 pm
Place: 4274 Chamberlin Hall
Speaker: Anna Hayes-Sterbenz, Los Alamos National Laboratory
Abstract: Recent analyses of the anti-neutrino flux from reactors has suggested that shot baseline reactor neutrino experiments saw only about 92.7% of the expected flux, a result is commonly referred to as the Reactor Neutrino Anomaly. In this talk I will present an independent analysis of this anomaly and the underlying nuclear physics determining the shape and magnitude of reactor neutrino spectra. In this analysis, we find that corrections due to forbidden beta-decays of fission fragments result in significant changes to the shape of the spectrum. These changes, which have not been taken into account in earlier anomaly analyses, leads to more anti-neutrinos being emitted at low (<2.5 MeV) and high energies (>4.5 MeV), and fewer anti-neutrinos between 2.5-4.5 MeV. The uncertainty in the shape of the spectrum also increases when the forbidden transitions are included. The measured spectrum from the near detector at Daya Bay should greatly help to reduce these uncertainties.
Host: Karsten Heeger
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Friday, May 17th, 2013

No events scheduled

"This Week at Physics" poster: http://www.physics.wisc.edu/twap/posters/2013/2013-05-13.pdf

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