Spring 2012 Seminar Series
Seminars are at 4pm, Tuesdays, in 472 Willamette Hall and are preceded cookies at 3:45.
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Explaining the Tevatron ttbar asymmetry with light axigluons
The forward-backward asymmetry of ttbar pair production at the Tevatron remains the most startling potential signal of new physics to date. In this talk I review a range of models that have been introduced to explain the anomaly and discuss experimental constraints on those new physics models. I then explore the feasibility of explaining the ttbar asymmetry with a light axigluon, and discuss search strategies for such an axigluon at the LHC.
The difficult astrophysics of supermassive black hole formation
University of Oregon, Physics
Presupposing the existence of supermassive black holes represents a convenient theorists toy chest for explaining both galaxy formation and the rapid onset of Quasar activity. Recent advancements in numerical hydrodynamics now shows possible formation through merging of giant
galaxies. However, this requires giant galaxies to exist at high redshift, something which is counter to all the other models. Other mechanisms require the existence of massive Population III stars as seeds or possible supermassive star clusters. All scenarios encounter practical problems that involve basic gas physics. This talk will summarize these methodologies and will ultimately suggest that supermassive black hole formation remains a mysterious process.
Last modified: Fr Aug 27 17:54:31 PDT 2010
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