Currents, charges, and canonical structure of pseudodual chiral models.

We discuss the pseudodual chiral model to illustrate a class of two-dimensional theories which have an in nite number of conservation laws but allow particle production, at variance with naive expectations. We describe the symmetries of the pseudodual model, both local and nonlocal, as transmutations of the symmetries of the usual chiral model. We re ne the conventional algorithm to more e ciently produce the nonlocal symmetries of the model, and we discuss the complete local current algebra for the pseudodual theory. We also exhibit the canonical transformation which connects the usual chiral model to its fully equivalent dual, further distinguishing the pseudodual theory. 1Work supported by the NSF grant PHY-92-09978. 2Work supported by the U.S. Department of Energy, Division of High Energy Physics, Contract W-31-109-ENG-38.