Rank Reduction of Conformal Blocks

Rank Reduction of Conformal Blocks Public Deposited

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Schuster, Michael
- Affiliation: College of Arts and Sciences, Department of Mathematics

Abstract

Let X be a smooth, pointed Riemann surface of genus zero, and G a simple, simply-connected complex algebraic group. Associated to a finite number of weights of G and a level is a vector space called the space of conformal blocks, and a vector bundle over \\bar{M}_{0,n}. We show that, assuming the weights are on a regular facet of the multiplicative polytope, the space of conformal blocks is isomorphic to a product of conformal blocks over groups of lower rank. If the weights are on a classical wall, then we also show that there is an isomorphism of conformal blocks bundles, giving an explicit relation between the associated nef divisors. The methods of the proof are geometric, and use the identification of conformal blocks with spaces of generalized theta functions, and the moduli stacks of parahoric bundles recently studied by Balaji and Seshadri. We conclude this dissertation with a number of examples in types A and C.

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