A new approach to instanton calculations in the O(3) nonlinear sigma model
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We construct all instantons in the \nlsig\ on a cylindrical space-time, known not to exist on a finite time interval. The scale parameter, $ρ$, is related to the boundary condition in time. This may cure the $ρ\rightarrow0$ divergent instanton gas, through a proper inclusion of in and out states in the path integral.
References added and corrected. Contribution to Lattice'94, 27 Sep - 1 Oct 1994, Bielefeld, Germany. 3 pages PostScript, uuencoded compressed
References added and corrected. Contribution to Lattice'94, 27 Sep - 1 Oct 1994, Bielefeld, Germany. 3 pages PostScript, uuencoded compressed