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- W2068756783 abstract "We study the instanton in the nonlinear two-dimensional $ensuremath{sigma}$ model and show that it can be interpreted, in Minkowski space, as a tunneling process through a potential barrier between two vacuums. In this case the process carries nontrivial winding number. We then show, using this interpretation, that the $ensuremath{sigma}$-model vacuum is nevertheless unique by demonstrating that two such vacuums may also be connected by processes that carry zero winding number and which do not require tunneling through a barrier. Some geometrical aspects of instanton solutions are also given." @default.
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- W2068756783 date "1979-02-15" @default.
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- W2068756783 title "Nonlinear two-dimensional<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>σ</mml:mi></mml:math>-model instanton as a tunneling process" @default.
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- W2068756783 doi "https://doi.org/10.1103/physrevd.19.1214" @default.
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