Modifying hyperkaehler manifolds with circle symmetry

Details Modifying hyperkaehler manifolds with circle symmetry Modifying hyperkaehler manifolds with circle symmetry

2005-10-24

arxiv.org/abs/math/0510501v2

Mathematics

Differential Geometry

17 pages

Scientific paper

A construction is introduced for modifying hyperkaehler manifolds with tri-Hamiltonian circle action, that in favourable situations increases the second Betti number by one. This is based on the symplectic cut construction of Lerman. In 4 or 8 dimensions the construction may be interpreted as adding a D6-brane. A number of examples are given and generalisations to three-Sasaki and hypersymplectic geometry discussed.

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