Tunneling Through Sphalerons: The O(3) Sigma-Model on a Cylinder
Abstract
We construct all instantons for the \ on a cylinder, known not to exist on a finite time interval. We show that the widest instantons go through sphalerons. A re-interpretation of moduli-space transforms the scale parameter to a boundary condition in time. This may give a handle on the →0 divergent instanton gas.
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