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This Week at Physics

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Events During the Week of October 20th through October 27th, 2013

Monday, October 21st, 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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Condensed Matter Theory Group Seminar
tba
Time: 4:30 pm
Place: Chamberin 5310
Speaker: Dushko Kuzmanovski, Physics Department
Host: Natalia Perkins
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Tuesday, October 22nd, 2013

Chaos & Complex Systems Seminar
A physics approach to understanding complex networks (Clay Memorial Lecture)
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Michelle Girvan, University of Maryland
Abstract: Many natural, technological, and social systems take the form of networks. Examples include metabolic networks, the Internet, and friendship networks. In the last decade or so, the new field of aEurooenetwork scienceaEuro has emerged, with physicists playing a key role applying methods from statistical mechanics and nonlinear dynamics to understand the behavior of these complex networks. In this talk, I will discuss how a physics approach to such problems can give us new insights into social, biological, and technological systems, and IaEuroTMll give several examples from my own research.<br>
<br>
This talk was made possible by a generous donation from Jane Clay in memory of her late husband Clarence Clay (1923-2011) who was an active participant in the seminars and who was a student of physics and professor in the Department of Geoscience specializing in oceanography at the University of Wisconsin.
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Theory Seminar (High Energy/Cosmology)
The Many Ways to Galileon Inflation and an Intriguing Window in Parameter Space
Time: 4:00 pm
Place: 5280 Chamberlin
Speaker: Matteo Fasiello, Case Western Reserve University
Abstract: Galileon theories enjoy a number of properties that make their use in inflationary setups particularly compelling. We will illustrate how one arrives at a stable and predictive theory of Galileon inflation and characterize the predictions of this model. We further show how a region of the parameter space of the theory is consistent with a small bispectrum--large trispectrum configuration.
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Wednesday, October 23rd, 2013

Theory Seminar (High Energy/Cosmology)
Yukawas in F-theory GUTs
Time: 1:00 pm
Place: Chamberlin 5280
Speaker: Fernando Marchesano, Instituto de Fısica Teorica, Madrid
Host: Gary Shiu
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Thursday, October 24th, 2013

Astronomy Colloquium
Galaxy Clusters in the Distant Universe
Time: 3:30 pm
Place: 4421 Sterling Hall
Speaker: Kim-Vy Tran, Texas A&M University
Abstract: Galaxy clusters are the largest gravitationally bound systems in the<br>
universe and are extreme laboratories for studying the physics driving<br>
galaxy evolution as well as powerful tests of cosmology.<br>
Understanding how galaxies form and evolve in clusters continues to be<br>
a fundamental question in astronomy. I present results from an<br>
ongoing multi-wavelength study of galaxies in clusters at z&gt;1.5 to<br>
track how they assemble their stars.
Host: Prof Christy Tremonti
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Friday, October 25th, 2013

Theory Seminar (High Energy/Cosmology)
Title to be announced
Time: 2:00 pm
Place: 5280 Chamberlin Hall
Speaker: Yue Zhao, Stanford University
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Theory Seminar (High Energy/Cosmology)
Search for signatures of dark matter induced nucleon decay
Time: 2:00 pm
Place: 5280 Chamberlin Hall
Speaker: Yue Zhao, Stanford University
Abstract: If dark matter (DM) carries baryon and/or lepton number, a DM particle may annihilate with a nucleon by flipping to anti-DM. We introduce a model where DM is asymmetric and carries B and L as -1/2. It can annihilate with a nucleon to meson, lepton and anti-DM. Such signal may be observed in proton decay experiments, similar signal has been studied in detail in arXiv:1008.2399, though in a different channel. If DM is captured in the Sun, the DM induced nucleon decay could generate a large flux of neutrinos, which could be observed in neutrino experiments. Furthermore, the anti-DM particle in the final state obtains a relatively large momentum (few hundred MeV), and escape the Sun. These fast anti-DM particles could also induce interesting signals in various ground experiments.
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Physics Department Colloquium
Multiwavelength Astronomy, the Origin of Cosmic Rays, and the HAWC Observatory
Time: 3:30 pm
Place: 2241 Chamberlin Hall (coffee at 4:30 pm)
Speaker: Petra Hüntemeyer, Michigan Technological University
Abstract: Currently, the High-Altitude Water Cherenkov or HAWC Observatory is being built at a site about a two hours drive east of Puebla, Mexico, on the Sierra Negra plateau (4100 m a.s.l.). As an all-sky instrument HAWC is particularly well suited to measure extended and large scale structures in the sky like galactic diffuse gamma-ray emission, or large and small-scale anisotropies. In addition, discoveries of other extended unidentified objects at TeV energies, for example collocated with the aEurooeFermi BubblesaEuro, are possible. In recent years, researchers have focused their attention increasingly on the combination of sky measurements in different wavebands of the electromagnetic spectrum. The construction of HAWC funded through NSF, DoE, and CONACyT is expected to be completed by Fall 2014. Data is already being collected during construction with an increasingly sensitive detector allowing for synchronous observations with instruments at other wavebands such as the Fermi Space Telescopes. I will present scientific potential - especially within the context of multiwavelength astronomy and its relevance to the cosmic-ray origin - and first results of the experiment.
Host: Westerhoff
Poster: http://www.physics.wisc.edu/twap/posters/2013/3024.pdf
Video: http://www.physics.wisc.edu/vod/2013/10/25.html
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"This Week at Physics" poster: http://www.physics.wisc.edu/twap/posters/2013/2013-10-21.pdf

©2013 Board of Regents of the University of Wisconsin System