Lax operators, Poisson groups, and the differential Galois theory

Research paper by M. A. Semenov-Tian-Shansky

Indexed on: 08 Nov '14Published on: 08 Nov '14Published in: Theoretical and Mathematical Physics


We examine the transfer of a Poisson structure in a space of differential or difference Lax operators to the space of solutions of the corresponding auxiliary problem (the space of wave functions) in detail. We investigate a spontaneous symmetry breaking resulting in the appearance of a nontrivial Poisson structure on the differential or difference Galois group. We review the difference version of the Drinfeld-Sokolov theory and describe a new type of classical r-matrices related to generalized exchange algebras.