Current Algebras and Groups

Let M be a smooth manifold and G a Lie group. In this book we shall study infinite-dimensional Lie algebras associated both to the group Map(M, G) of smooth mappings from M to G and to the group of dif­ feomorphisms of M. In the former case the Lie algebra of the group is the algebra Mg of smooth mappings from M to the Lie algebra gof G. In the latter case the Lie algebra is the algebra Vect M of smooth vector fields on M. However, it turns out that in many applications to field theory and statistical physics one must deal with certain extensions of the above mentioned Lie algebras. In the simplest case M is the unit circle SI, G is a simple finite­ dimensional Lie group and the central extension of Map( SI, g) is an affine Kac-Moody algebra. The highest weight theory of finite­ dimensional Lie algebras can be extended to the case of an affine Lie algebra. The important point is that Map(Sl, g) can be split to positive and negative Fourier modes and the finite-dimensional piece g corre­ sponding to the zero mode. Front Matter....Pages i-xvii Semisimple Lie Algebras....Pages 1-20 Representations of Affine Kac-Moody Algebras....Pages 21-42 Principal Bundles....Pages 43-74 Extensions of Groups of Gauge Transformations....Pages 75-104 The Chiral Anomaly....Pages 105-126 Determinant Bundles over Grassmannians....Pages 127-170 The Virasoro Algebra....Pages 171-191 The Boson Fermion Correspondence....Pages 193-202 Holomorphic Aspects of String Theory....Pages 203-233 The Nonlinear σ Model....Pages 235-244 The Kp Hierarchy....Pages 245-265 The Fock Bundle of a Dirac Operator and Infinite Grassmannians....Pages 267-297 Back Matter....Pages 299-313