Theory Talk is an informal setting for fellow NC State physicists to see and hear work currently being pursued within the department. Speakers are encouraged to talk about work in progress and exchange ideas with the audience. Faculty, postdocs, and especially graduate students are encouraged to attend and present. Interested visitors and researchers from the Triangle area are also welcome.


Sergey Monin (University of Minnesota)
Wednesday, 3:30 PM, February 22, Riddick 400P
Heterotic Non-Abelian String of a Finite Length
We consider non-Abelian strings in N=2 supersymmetric QCD with the U(N) gauge group and N_f=N quark flavors deformed by a mass term for the adjoint matter. This deformation breaks N=2 supersymmetry down to N=1. Dynamics of orientational zero modes on the string world sheet are described then by CP(N−1) model with N=(0,2) supersymmetry. We study the string of a finite length L assuming compactification on a cylinder (periodic boundary conditions). The world-sheet theory is solved in the large-N approximation. We find a rich phase structure in the (L,u) plane where u is a deformation parameter. We also discuss how this phase structure matches the N=(2,2) limit in which the world-sheet theory has a single phase with the mass gap independent of L.