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Events on Friday, March 15th, 2013

Theory Seminar (High Energy/Cosmology)
Instantons on R^3 x S^1 and a semi-classical realization of IR renormalons
Time: 11:00 am
Place: 5310 Chamberlin
Speaker: Phillip Argyres, Cincinnati
Abstract: We study the semi-classical dynamics of four dimensional gauge theories with adjoint fermions compactified on a circle with periodic boundary conditions for the fermions. There are monopole-instantons (with fermion zero modes) and two types of monopole--anti-monopole molecules, called bions. The plasma of the type-one bions--- which carry net magnetic charge---induces a mass gap for gauge fluctuations. The type-two bion is both topologically and magnetically neutral, and its understanding requires a generalization of multi-instanton techniques in quantum mechanics to compactified field theory. We conjecture that it is the semi-classical realization of four-dimensional IR renormalons.
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Physics Department Colloquium
New perspectives on quark confinement
Time: 3:30 pm
Place: 2241 Chamberlin Hall (coffee at 4:30 pm)
Speaker: Philip Argyres, University of Cincinnati
Abstract: The confinement of quarks inside protons and neutrons is thought to follow from the theory of the strong force, quantum chromodynamics (QCD). By now very convincing numerical evidence for this has been found by computer simulations of QCD, but an actual derivation of confinement using analytical techniques has resisted all attempts to date. This talk will review the concepts and problems involved in trying to explain confinement analytically, and will present some recent work that sheds light on when and how confinement arises when QCD and similar theories are given periodic boundary conditions in one spatial direction.
Host: Hashimoto
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