Coupled vortex equations and Moduli: Deformation theoretic Approach and Kaehler Geometry

Details Coupled vortex equations and Moduli: Deformation theoretic Approach and Kaehler Geometry Coupled vortex equations and Moduli: Deformation theoretic Approach and Kaehler Geometry

2008-08-24

arxiv.org/abs/0808.3260v1

Mathematics

Algebraic Geometry

Scientific paper

We investigate differential geometric aspects of moduli spaces parametrizing solutions of coupled vortex equations over a compact Kaehler manifold X. These solutions are known to be related to polystable triples via a Kobayashi-Hitchin type correspondence. Using a characterization of infinitesimal deformations in terms of the cohomology of a certain elliptic double complex, we construct a Hermitian structure on these moduli spaces. This Hermitian structure is proved to be Kaehler. The proof involves establishing a fiber integral formula for the Hermitian form. We compute the curvature tensor of this Kaehler form. When X is a Riemann surface, the holomorphic bisectional curvature turns out to be semi--positive. It is shown that in the case where X is a smooth complex projective variety, the Kaehler form is the Chern form of a Quillen metric on a certain determinant line bundle.

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