Theoretical High Energy Seminar – Niels Bohr Institute - University of Copenhagen

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Niels Bohr Institute > Calendar > 2009 > Theoretical High Energ...

Theoretical High Energy Seminar

Mithat Unsal (SLAC and Stanford)

Title: Confinement, chiral dynamics and conformal window via  deformed Yang-Mills theories

Abstract: 

The non-perturbative dynamics of non-supersymmetric QCD-like and chiral gauge theories  remained largely elusive despite much effort over the years.  Recently, novel techniques (such as center stabilizing double trace  deformations and  twisted partition functions) which allow us to continuously connect  the physics of these gauge theories on R4 to  small S1 \times R3 are found. In most cases, the physics of small S1 is analytically tractable by semi-classical techniques.

There are many novel topological excitations that appear in this regime which were not  anticipated earlier. For example, a type of composite referred to as magnetic bion (which is neither a monopole, nor an instanton) with net magnetic charge +2 is responsible for the appearance of a mass gap in large class of QCD-like and chiral theories.

These techniques also find useful applications in chiral gauge theories, in the study of  conformal window, supersymmetric gauge theories and to dynamical supersymmetry breaking. In this talk, I will give an elementary introduction to these new methods and to the dynamics of gauge theories through this window. Parts of these works are done in various collaborations with Poppitz, Shifman and Yaffe.