Character Varieties

By Adam S. Sikora. 2009

172 citations recorded by the source corpus.

We study properties of irreducible and completely reducible representations of finitely generated groups Gamma into reductive algebraic groups G in in the context of the geometric invariant theory of the G-action on Hom(Gamma,G) by conjugation. In particular, we study properties of character varieties, X_G(Gamma)=Hom(Gamma,G)//G. We describe the tangent spaces to X_G(Gamma) in terms of first cohomology groups of Gamma with twisted coefficients, generalizing the well known formula. Let M be an orientable 3-manifold with a connected boundary F of genus>1 and let X_G^g(F) be the subset of the G -character variety of F composed of conjugacy classes of good representations. By a theorem of Goldman, X_G^g(F) is a holomorphic symplectic manifold. We prove that the set of good G-representations of pi_1(F) which extend to representations of pi_1(M) is an isotropic submanifold of X_G^g(F). If these representations correspond to reduced points of the G-character variety of M then this submanifold is Lagrangian.

Subfields: Geometry and Topology, Mathematical Physics

View Paper: https://www.semanticscholar.org/paper/3bb2b02c5af47183099ceaff1e8eb72225643959

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In Geometry and Topology

1. P. Boalch
2. Daisuke Yamakawa
3. T. Mochizuki
4. Dan Xie

In Mathematical Physics

1. P. Boalch
2. Daisuke Yamakawa
3. T. Mochizuki
4. Carlos Simpson
5. Dan Xie

Citations in the corpus

• Geometry and braiding of Stokes data; Fission and wild character varieties (2011, background): “” (See [58] and references therein for the usual case.”