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Complex instantons in sigma models with chemical potential

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Bruckmann, Falk ; Lochner, Stephan
Date of publication of this fulltext: 14 Feb 2019 11:22


We analyze two-dimensional nonlinear sigma models at nonzero chemical potentials, which are governed by a complex action. In the spirit of contour deformations (thimbles), we extend the fields into the complex plane, which allows us to incorporate the chemical potentials mu as twisted boundary conditions. We write down the equations of motion and find exact BPS-like solutions in terms of pairs of ...


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