Mathematics – Representation Theory
Scientific paper
2008-04-22
Moscow Mathematical Journal, Vol. 8, n.4, 759--788 (2008)
Mathematics
Representation Theory
Comments: Latex file, 37 pages. This is a revised version of the paper published in Moscow Mathematical Journal, Vol. 8, n. 4,
Scientific paper
Let L be a finite-dimensional semisimple Lie algebra with a non-degenerate invariant bilinear form, \sigma an elliptic automorphism of L leaving the form invariant, and A a \sigma-invariant reductive subalgebra of L, such that the restriction of the form to A is non-degenerate. Consider the associated twisted affine Lie algebras L^, A^, and let F be the \sigma-twisted Clifford module over A^ associated to the orthocomplement of A in L. Under suitable hypotheses on\sigma and A, we provide a general formula for the decomposition of the kernel of the affine Dirac operator, acting on the tensor product of an integrable highest weight L^-module and F, into irreducible A^-submodules. As an application, we derive the decomposition of all level 1 integrable irreducible highest weight modules over orthogonal affine Lie algebras with respect to the affinization of the isotropy subalgebra of an arbitrary symmetric space.
Frajria Pierluigi Moseneder
Kac Victor G.
Papi Paolo
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