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Events During the Week of October 17th through October 24th, 2010

Monday, October 18th, 2010

High Energy Seminar
Searching for a low mass Higgs at DZero
Time: 4:00 pm - 5:00 pm
Place: 4274 Chamberlin: Coffee and Cookies at 3:45 pm
Speaker: Joe Haley, Northeastern University
Abstract: While the Standard Model has proven itself time and time again, we
have yet to find the elusive Higgs boson that is central to
electroweak symmetry breaking and also provides a mechanism for
giving masses to fermions. The mass of the Higgs boson is not
predicted by the theory, but indirect precision measurements favor a
relatively low mass. Coincidentally, a low mass Higgs (less than
~130 GeV) will also be the most difficult for the LHC to find due to
the enormous backgrounds. With ever increasing data sets, improved
understanding of backgrounds, and advanced analysis techniques, the
Tevatron experiments provide the best opportunity to find a low mass
Higgs boson in the near future. I will describe the low mass Higgs
boson search at the D0 experiment. In addition to presenting the
most recent results, I will highlight the strategy for performing a
low mass Higgs search and the advanced tools used to improve
Host: Matthew Herndon
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Tuesday, October 19th, 2010

String Theory Seminar
Conifunneling - Stringy Tunneling in the Landscape
Time: 4:00 pm
Place: 5280 Chamberlin
Speaker: David Kagan, Columbia University
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Wednesday, October 20th, 2010

Department Meeting
Time: 12:15 pm
Place: 5310 Chamberlin Hall
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Thursday, October 21st, 2010

R. G. Herb Condensed Matter Seminar
Scotch Tape Method: Not just for Graphene
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Ken Burch, University of Toronto
Abstract: Recently mechanical exfoliation has received a great deal attention (2010 Physics Nobel) for producing single atomic sheets of graphene. However this method is incredibly flexible and has opened a new route to producing materials on the nanoscale. Materials with Nanometer thickness are an appealing platform for devices as well as exploring the roles of dimensionality, disorder, and free carrier density in complex materials. To this end we have produced exfoliated crystals of Bi2Sr2CaCu2O8 and Bi2Se3 on a variety of substrates. I will discuss unique advantages of this technique as well as some of the challenges it posses. Interestingly we have observed subtle differences in the Raman spectra between the exfoliated and bulk crystals enabling noninvasive determination of thickness (Bi2Se3) and Doping level (Bi-2212).
Host: Natalia Perkins
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
Predicting Antineutrino Flux with DRAGON
Time: 4:00 pm
Place: 4274 Chamberlin
Speaker: Christopher Jones, MIT
Abstract: Simulation of a nuclear reactor is extremely important for Double Chooz, an antineutrino experiment whose goal is to extract theta_{13}, and for noninvasive nuclear nonproliferation. An overview of Double Chooz and reactor physics will be given, along with a summary of reactor simulation efforts and code validation. The seminar will conclude with a discussion about the role of simulations in nonproliferation scenarios
Host: Stefan Westerhoff
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Graduate Introductory Seminar
Astrophysics I: IceCube, HAWC, Auger
Time: 5:30 pm - 6:30 pm
Place: 2223 Chamberlin Hall
Speaker: Halzen, Karle, Montaruli, Ogelman, Westerhoff
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Friday, October 22nd, 2010

Phenomenology Seminar
Theory/Phenomenology Seminar
LHC signals of little Higgs models
Time: 2:30 pm - 3:30 pm
Place: 5280 Chamberlin Hall
Speaker: Pedro Schwaller, University of Illinois at Chicago
Host: Vernon Barger
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Physics Department Colloquium
Morphogen gradient formation in subdiffusive media
Time: 4:00 pm
Place: 2241 Chamberlin Hall (coffee at 3:30 pm)
Speaker: Katja Lindenberg, UC-San Diego
Abstract: Morphogens are signaling molecules that act directly on cells to produce specific cellular responses dependent on morphogen concentration. The morphogens are produced at a point in space at a constant rate, move around in the cell, and are also subject to degradation at a rate that may depend on location. The resulting morphogen concentration gradients determine which response is produced where in the cell or in a group of cells.

The shape of the gradient is obviously important in this process, and this shape is determined by the way the morphogens move and degrade in the cell. While different degradation processes have been considered in the literature, the motion of the morphogens is almost always assumed to be diffusive in spite of the barriers and traps presented by the crowded cellular environment. We explore the consequences of subdiffusive motion, that is, morphogen motion that is impeded by the obstacles in the environment. We conclude that morphogen concentration profiles are very sensitive not only to the details of the degradation process but also to the morphogen motion.
Host: Coppersmith
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