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"Topology and confinement"

Relatore: Dr Ernst Michael Ilgenfritz- Humboldt University (Berlin - D)

Sala Feynman
20 Marzo 2007 ore 15.30

I will describe recent attempts to get out confinement from a semiclassical model at finite temperature based on calorons with nontrivial holonomy. This should be considered as a realization of the idea that fractional instantons provide confinement at zero temperature. I will report on lattice obeservations that give support for this picture in the confinement phase. I will discuss the status of explorations of the vacuum structure by means of overlap fermions and explain in which way this can be related to models in terms of selfdual lumps (instanton and caloron models).