Landau-Lifshitz equation: solitons, quasi-periodic solutions and infinite-dimensional Lie algebras

Abstract
The hierarchy of the Landau-Lifshitz equation S1=S*Sxx+S*JS with full anisotropy is formulated in terms of a free fermion phi (P) on an elliptic curve. An infinite-dimensional Lie algebra spanned by quadratic forms of phi (P) is shown to act on solutions as infinitesimal Backlund transformations. On the basis of a bilinear identity of wavefunctions, an N-soliton formula is proved and quasi-periodic solutions are constructed.

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