Toric Structures on Symplectic Bundles of Projective Spaces

Details Toric Structures on Symplectic Bundles of Projective Spaces Toric Structures on Symplectic Bundles of Projective Spaces

2012-02-15

arxiv.org/abs/1202.3422v1

Mathematics

Symplectic Geometry

26 pages, one figure

Scientific paper

Recently, extending work by Karshon, Kessler and Pinsonnault, Borisov and McDuff showed that a given symplectic manifold $(M,\omega)$ has a finite number of distinct toric structures. Moreover, McDuff also showed a product of two projective spaces $\bC P^r\times \bC P^s$ with any given symplectic form has a unique toric structure provided that $r,s\geq 2$. In contrast, the product $\bC P^r \times \bC P^1$ can be given infinitely many distinct toric structures, though only a finite number of these are compatible with each given symplectic form $\omega$. In this paper we extend these results by considering the possible toric structures on a toric symplectic manifold $(M,\omega)$ with $\dim H^2(M)=2$. In particular, all such manifolds are $\bC P^r$ bundles over $\bC P^s$ for some $r,s$. We show that there is a unique toric structure if $r

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