Speaker
Robert Pisarski
(Brookhaven National Laboratory)
Description
I discuss how objects with topological charge 1/N can arise in CP(N-1) models in 1+1 dimensions, and in SU(N) gauge theories, without dynamical quarks, in 3+1 dimensions. The ansatz involves multivalued functions: a Z(N) vortex in the former, and a Z(N) monopole in the latter. Unlike classical instantons, such a quantum instanton has a fixed size on the order of the scale for confinement. They thus smoothly connect to the configurations found by Unsal, Poppitz et al. on a femto-slab. In gauge theories, as the object carries magnetic charge, they are confined by the presence of dynamical quarks. I discuss how they might affect the topological susceptibility in QCD at low temperatures and especially for cold, dense QCD.
Primary authors
Robert Pisarski
(Brookhaven National Laboratory)
V. P. Nair
(City College of New York)
