%0 Journal Article
%T On the Vacuum Energy Density and Non-Perturbative Effects in Sigma Models
%A V. G. Ksenzov
%J Physics
%D 1994
%I arXiv
%R 10.1016/0370-2693(94)90214-3
%X The vacuum energy density is obtained for the $O(N)$ nonlinear sigma model. It is shown that non-perturbative contributions are connected with the square of the symmetry current of the group $O(N)$. This result is valid for $\sigma$- fields which are subject to the constraint.
%U http://arxiv.org/abs/hep-th/9402123v1