Hidden Symmetries of the Principal Chiral Model Unveiled
C. Devchand, Jeremy Schiff
Abstract
By relating the two-dimensional U(N) Principal Chiral Model to a simple linear system we obtain a free-field parametrisation of solutions. Obvious symmetry transformations on the free-field data give symmetries of the model. In this way all known `hidden symmetries' and Bäcklund transformations, as well as a host of new symmetries, arise.
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