On the Vacuum Energy Density and Non-Perturbative Effects in Sigma Models

Abstract

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.

arXiv commentpage5,latex,ITEP-28-93

Cited by in corpus (2)

• On the Calculation of the Vacuum Energy Density in Sigma Models
• New approach to the non-perturbative physics