English

The symplectic structure of a toric conic transform

Symplectic Geometry 2022-05-24 v1

Abstract

Suppose that a compact rr-dimensional torus TrT^r acts in a holomorphic and Hamiltonian manner on polarized complex dd-dimensional projective manifold MM, with nowhere vanishing moment map Φ\Phi. Assuming that Φ\Phi is transverse to the ray through a given weight ν\boldsymbol{\nu}, associated to these data there is a complex (dr+1)(d-r+1)-dimensional polarized projective orbifold M^ν\hat{M}_{\boldsymbol{\nu}} (referred to as the ν\boldsymbol{\nu}-th \textit{conic transform} of MM). Namely, M^ν\hat{M}_{\boldsymbol{\nu}} is a suitable quotient of the inverse image of the ray in the unit circle bundle of the polarization of MM. With the aim to clarify the geometric significance of this construction, we consider the special case where MM is toric, and show that M^ν\hat{M}_{\boldsymbol{\nu}} is itself a K\"{a}hler toric obifold, whose moment polytope is obtained from the one of MM by a certain "transform", operation (depending on Φ\Phi and ν\boldsymbol{\nu}).

Keywords

Cite

@article{arxiv.2205.10585,
  title  = {The symplectic structure of a toric conic transform},
  author = {Roberto Paoletti},
  journal= {arXiv preprint arXiv:2205.10585},
  year   = {2022}
}
R2 v1 2026-06-24T11:24:15.149Z