Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1995-11-08
Phys.Lett. B367 (1996) 237-241
Physics
High Energy Physics
High Energy Physics - Theory
9 pages, latex
Scientific paper
10.1016/0370-2693(95)01420-9
The vacuum energy density is calculated for the $O(N)$ nonlinear sigma models in two dimensions. To obtain $\varepsilon_{vac}$ we assume that each point of the space in which non-perturbative f\/ields are determined can be replaced by a sphere $S^2$ having a small radius $r$ which approaches zero at the very end of the calculation. This assumption allows to get the classical f\/ields generating v.e.v. of the trace of the energy-momentum tensor.
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