Asymptotics of Szegö kernels under Hamiltonian torus actions

Details Asymptotics of Szegö kernels under Hamiltonian torus actions Asymptotics of Szegö kernels under Hamiltonian torus actions

2010-06-22

arxiv.org/abs/1006.4273v2

Mathematics

Symplectic Geometry

exposition improved

Scientific paper

Let $X$ be the circle bundle associated to a positive line bundle on a complex projective (or, more generally, compact symplectic) manifold. The Tian-Zelditch expansion on $X$ may be seen as a local manifestation of the decomposition of the (generalized) Hardy space $H(X)$ into isotypes for the $S^1$-action. More generally, given a compatible action of a compact Lie group, and under general assumptions guaranteeing finite dimensionality of isotypes, we may look for asymptotic expansions locally reflecting the equivariant decomposition of $H(X)$ over the irreducible representations of the group. We focus here on the case of compact tori.

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