Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1994-04-06
Commun.Math.Phys. 177 (1996) 561-582
Physics
High Energy Physics
High Energy Physics - Theory
27 pages (harvmac) + 3 figures (LaTex) at the end of the file, Swansea SWAT/93-94/19
Scientific paper
Affine Toda field theories in two dimensions constitute families of integrable, relativistically invariant field theories in correspondence with the affine Kac-Moody algebras. The particles which are the quantum excitations of the fields display interesting patterns in their masses and coupling and which have recently been shown to extend to the classical soliton solutions arising when the couplings are imaginary. Here these results are extended from the untwisted to the twisted algebras. The new soliton solutions and their masses are found by a folding procedure which can be applied to the affine Kac-Moody algebras themselves to provide new insights into their structures. The relevant foldings are related to inner automorphisms of the associated finite dimensional Lie group which are calculated explicitly and related to what is known as the twisted Coxeter element. The fact that the twisted affine Kac-Moody algebras possess vertex operator constructions emerges naturally and is relevant to the soliton solutions.
Kneipp Marco A. C.
Olive David I.
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