Automorphic forms with singularities on Grassmannians

Details Automorphic forms with singularities on Grassmannians Automorphic forms with singularities on Grassmannians

1996-09-29

arxiv.org/abs/alg-geom/9609022v2

Invent. Math. 132, 491-562 (1998)

Physics

High Energy Physics

High Energy Physics - Theory

65 pages plain tex. References added, introduction improved. To appear in Invent. Math

Scientific paper

We construct some families of automorphic forms on Grassmannians which have singularities along smaller sub Grassmannians, using Harvey and Moore's extension of the Howe (or theta) correspondence to modular forms with poles at cusps. Some of the applications are as follows. We construct families of holomorphic automorphic forms which can be written as infinite products, which give many new examples of generalized Kac-Moody superalgebras. We extend the Shimura and Maass-Gritsenko correspondences to modular forms with singularities. We prove some congruences satisfied by the theta functions of positive definite lattices, and find a sufficient condition for a Lorentzian lattice to have a reflection group with a finite volume fundamental domain. We give some examples suggesting that these automorphic forms with singularities are related to Donaldson polynomials and to mirror symmetry for K3 surfaces.

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