Rank One Higgs Bundles and Representations of Fundamental Groups of Riemann Surfaces

Details Rank One Higgs Bundles and Representations of Fundamental Groups of Riemann Surfaces Rank One Higgs Bundles and Representations of Fundamental Groups of Riemann Surfaces

2004-02-26

arxiv.org/abs/math/0402429v2

Memoirs of the American Mathematical Society. 193 (2008), no. 904 , viii+69 pp

Mathematics

Differential Geometry

Scientific paper

This expository paper details the theory of rank one Higgs bundles over a closed Riemann surface X and their relationship to representations of the fundamental group of X. We construct an equivalence between the deformation theories of flat connections and Higgs pairs. This provides an identification of moduli spaces arising in different contexts. The moduli spaces are real Lie groups. From each context arises a complex structure, and the different complex structures define a hyper-Kaehlerstructure. The twistor space, real forms, and various group actions are computed explicitly in terms of the Jacobian of X. We describe the moduli spaces and their geometry in terms of the Riemann period matrix of X. This is the simplest case of the theory developed by Hitchin, Simpson and others. We emphasize its formal aspects that generalize to higher rank Higgs bundles over higher dimensional Kaehler manifolds.

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