Lagrangian Grassmannians of Polarizations

Peter Kristel and Eric Schippers ()
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Peter Kristel: Hausdorff Center for Mathematical Sciences
Eric Schippers: University of Manitoba

Chapter Chapter 6 in Surveys in Geometry II, 2024, pp 179-224 from Springer

Abstract: Abstract This chapter is an introduction to polarizations in the symplectic and orthogonal settings. They arise in association to a triple of compatible structures on a real vector space, consisting of an inner product, a symplectic form, and a complex structure. A polarization is a decomposition of the complexified vector space into the eigenspaces of the complex structure; this information is equivalent to the specification of a compatible triple. When either a symplectic form or inner product is fixed, one obtains a Grassmannian of polarizations. We give an exposition of this circle of ideas, emphasizing the symmetry of the symplectic and orthogonal settings, and allowing the possibility that the underlying vector spaces are infinite-dimensional. This introduction would be useful for those interested in applications of polarizations to representation theory, loop groups, complex geometry, moduli spaces, quantization, and conformal field theory.

Keywords: Lagrangian grassmannian; Polarizations; Symplectic form; Inner product; Siegel disk; Symplectic group; Orthogonal group; 15A66; 15B57; 32G15; 53D99; 81S10 (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1007/978-3-031-43510-2_6

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