Vol. 308, No. 2, 2020
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Topology of complexity one quotients

Yael Karshon and Susan Tolman
Vol. 308 (2020), No. 2, 333–346
DOI: 10.2140/pjm.2020.308.333
Abstract

We describe of the topology of the geometric quotients of 2n-dimensional compact connected symplectic manifolds with (n−1)-dimensional torus actions. When the isotropy weights at each fixed point are in general position, the quotient is homeomorphic to a sphere.

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Keywords
momentum map, torus action, toric topology, Grassmannian, complexity one, Hamiltonian group action, symplectic quotient, geometric quotient
Mathematical Subject Classification
Primary: 53D20
Milestones
Received: 11 March 2019
Revised: 28 May 2020
Accepted: 29 May 2020
Published: 9 December 2020
Authors
Yael Karshon
Department of Mathematics
University of Toronto
Toronto, ON
Canada
Susan Tolman
Department of Mathematics
University of Illinois at Urbana-Champaign
Urbana, IL
United States