Mathematics – Representation Theory
Scientific paper
2009-02-16
Mathematics
Representation Theory
34 pages, to appear in Transactions of AMS
Scientific paper
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.
No associations
LandOfFree
Character Varieties does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Character Varieties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Character Varieties will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-462255