A Symplectic Isotopy of a Dehn Twist on CP^n x CP^{n+1}

Details A Symplectic Isotopy of a Dehn Twist on CP^n x CP^{n+1} A Symplectic Isotopy of a Dehn Twist on CP^n x CP^{n+1}

2008-02-03

arxiv.org/abs/0802.0306v1

Mathematics

Symplectic Geometry

20 pages, 6 figures

Scientific paper

The complex manifold CP^n x CP^{n+1} with symplectic form \sigma_\mu=\sigma_{CP^n}+\mu\sigma_{CP^{n+1}}, where \sigma_{CP^n} and \sigma_{CP^{n+1}} are normalized Fubini-Study forms, n a natural number and \mu>1 a real number, contains a natural Lagrangian sphere L^{\mu}. We prove that the Dehn twist along L^{\mu} is symplectically isotopic to the identity for all \mu>1. This isotopy can be chosen so that it pointwise fixes a complex hypersurface in CP^n x CP^{n+1} and lifts to the blow-up of CP^n x CP^{n+1} along a complex n-dimensional submanifold.

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