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Events at Physics

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Events on Tuesday, December 6th, 2011

Chaos & Complex Systems Seminar
A history of El Niño / the Southern Oscillation
Time: 12:05 pm
Place: 4274 Chamberlin
Speaker: Dan Vimont, UW Department of Atmospheric and Oceanic Scicnces
Abstract: This talk will provide a brief history of our understanding of the El Nino / Southern Oscillation (ENSO) phenomena from the late 1800's through the present. The talk will highlight how advances in our observational networks and theoretical understanding of the tropical atmosphere and ocean - advances that were not necessarily motivated by a desire to understand ENSO - have shaped the development of ENSO theory. Finally, I will discuss an emerging shift in our current understanding of ENSO variability from the perception of ENSO as a linearly unstable mode of variability to thinking of ENSO as a linearly stable phenomenon that experiences transient growth through non-normal processes.
Host: Sprott
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Theory Seminar (High Energy/Cosmology)
Stealth Supersymmetry
Time: 4:00 pm
Place: 5280 Chamberlin Hall
Speaker: Matt Reece, Harvard University
Abstract: The first year of LHC data has dramatically reduced the allowed parameter space for low-energy supersymmetry, given certain assumptions. In this talk I will summarize the current state of these experimental limits, emphasizing which assumptions might be evaded to allow standard SUSY spectra to survive. I will then present an example of a class of models that are not yet constrained, called "Stealth Supersymmetry." These are models in which certain nearly-supersymmetric states present in decay chains lead to collider signatures without missing energy. I will discuss some specific examples of models in this class, and explain how the LHC might search for them.
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