Margarita Garcia Pérez
Reducing the volume in Yang-Mills theories
We will discuss the interplay between volume and group degrees of freedom in Yang-Mills theory. In the limit of infinite number of colours this has led to the concept of volume independence through Eguchi-Kawai reduction. We will review some attempts to extend this idea beyond the large N limit. A few non-perturbative examples will be shown, including the running of the SU(N) .t Hooft coupling and the 2+1 dimensional glueball spectrum.