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This Week at Physics

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Events During the Week of September 29th through October 6th, 2013

Monday, September 30th, 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, October 1st, 2013

Chaos & Complex Systems Seminar
Aging and delayed aging by caloric restriction
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Rozalyn Anderson, UW School of Medicine and Public Health
Abstract: Biology of aging research provides insights into the molecular and cellular aspects of the aging process and the factors contributing to the increase in disease vulnerability observed with advancing age. Caloric restriction (CR) without malnutrition delays aging and extends lifespan in diverse species. In exploring CRaEuroTMs mechanisms we stand to gain a unique perspective on the biology of aging, including the complex nature of its underlying regulatory processes.
Host: Clint Sprott
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Theory Seminar (High Energy/Cosmology)
U(1) Portals into Hidden Sectors
Time: 4:00 pm
Place: Chamberlin 5280
Speaker: Pablo Soler, Hong Kong IAS and University of Wisconsin
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Wednesday, October 2nd, 2013

Department Meeting
Time: 12:15 pm
Place: 5310 Chamberlin Hall
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Thursday, October 3rd, 2013

R. G. Herb Condensed Matter Seminar
Quantum Critical Spin Systems
Title to be announced
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Ribhu K. Kaul, University of Kentucky, Lexington
Abstract: Close to the absolute zero of temperature, when pushed to the edge between two phases of matter, simple lattice Hamiltonians of spins can display the incredibly rich phenomena of "quantum criticality". Quantum critical ground states are described by the most complex wavefunctions known to physicists, yet they can be categorized by "universality classes" that are independent of the details of the Hamiltonians that realize them. In this seminar I will show how such quantum critical spin systems can arise in real-world transition metal oxide materials, and explain our successes in developing quantum many-body simulations of a new universality class of "deconfined" quantum critical points.
Host: Perkins
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Friday, October 4th, 2013

Theory Seminar (High Energy/Cosmology)
The Dilaton, the Radion, and Duality
Time: 2:00 pm
Place: 5280 Chamberlin Hall
Speaker: Zackaria Chacko, University of Maryland
Abstract: I consider scenarios where strong conformal dynamics constitutes the ultraviolet completion of the physics that drives electroweak symmetry breaking. I identify the circumstances under which the dilaton can remain light, and construct the effective theory of the light dilaton in this framework. The form of the dilaton couplings to Standard Model states is determined, and corrections from conformal symmetry violating effects are shown to be under good theoretical control in theories where the dilaton is light. I then show how the same results emerge from extra dimensional warped constructions, with the dilaton identified as the radion, as expected from the AdS/CFT correspondence.
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Physics Department Colloquium
Cosmic Past, Present, Future: Planck and Beyond
Time: 3:30 pm
Place: 2241 Chamberlin Hall (coffee at 4:30 pm)
Speaker: Benjamin Wandelt, Paris Institute for Astrophysics (IAP) at the Université Pierre et Marie Curie, Sorbonne University
Abstract: How can we learn what banged at the Big Bang? We use astronomical observations to probe the epoch in the very early Universe where quantum fluctuations imprinted the seeds of cosmic structure. I will summarize the main results of the analysis of the cosmic microwave background temperature anisotropies as seen by the Planck mission data released in March 2013, with special emphasis on the non-Gaussianity analysis which resulted in the highest precision tests to date of physical mechanisms for the origin of cosmic structure. Then I will turn to the future and highlight the challenges and opportunities of the next generation of probes of the large scale structure of the universe aiming to piece together the outstanding puzzles of cosmic past, present, and future - with some glimpses onto the lab bench of innovative approaches that are now emerging.<br>
<br>
Host: Timbie
Poster: http://www.physics.wisc.edu/twap/posters/2013/3015.pdf
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"This Week at Physics" poster: http://www.physics.wisc.edu/twap/posters/2013/2013-09-30.pdf

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