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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 μ 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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