Differential algebras with Banach-algebra coefficients I: From C*-algebras to the K-theory of the spectral curve

Details Differential algebras with Banach-algebra coefficients I: From C*-algebras to the K-theory of the spectral curve Differential algebras with Banach-algebra coefficients I: From C*-algebras to the K-theory of the spectral curve

2011-04-07

arxiv.org/abs/1104.1453v1

Mathematics

Operator Algebras

Scientific paper

We present an operator-coefficient version of Sato's infinite-dimensional Grassmann manifold, and tau-function. In this context, the Burchnall-Chaundy ring of commuting differential operators becomes a C*-algebra, to which we apply the Brown-Douglas-Fillmore theory, and topological invariants of the spectral ring become readily available. We construct KK classes of the spectral curve of the ring and, motivated by the fact that all isospectral Burchnall-Chaundy rings make up the Jacobian of the curve, we compare the (degree-1) K-homology of the curve with that of its Jacobian. We show how the Burchnall-Chaundy C*-algebra extension of the compact operators provides a family of operator-valued tau-functions.

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