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• W2007023818 abstract "We consider asymptotically free nonlinear sigma models in two dimensions which, due to their internal symmetries, allow for a conserved charge. Introducing nonzero chemical potential for the $SO(2)$ subgroup of the symmetry group, we discuss two expected phase transitions, which are related to charge condensation and percolation of merons, respectively. The latter are topological objects with half integer charge similar to vortices in the Abelianized $O(2)$ theory that emerge for large chemical potentials due to the suppression of the complementary field components. We conjecture a particular ordering of these transitions supported by large $N$ calculations, and discuss dualities helpful for the understanding of these systems in the continuum and on the lattice. We suggest that a similar behavior is to be expected in QCD at nonzero density." @default.
• W2007023818 created "2016-06-24" @default.
• W2007023818 creator A5016992636 @default.
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• W2007023818 date "2014-11-11" @default.
• W2007023818 modified "2023-10-06" @default.
• W2007023818 title "Nonlinear sigma models at nonzero chemical potential: Breaking up instantons and the phase diagram" @default.
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• W2007023818 doi "https://doi.org/10.1103/physrevd.90.105010" @default.
• W2007023818 hasPublicationYear "2014" @default.
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