Connected Components of The Space of Surface Group Representations

Details Connected Components of The Space of Surface Group Representations Connected Components of The Space of Surface Group Representations

2003-03-20

arxiv.org/abs/math/0303255v1

IMRN 2003, no.44, 2359-2372

Mathematics

Symplectic Geometry

11 pages

Scientific paper

Let G be a connected, compact, semisimple Lie group. It is known that for a compact closed orientable surface $\Sigma$ of genus $l >1$, the order of the group $H^2(\Sigma,\pi_1(G))$ is equal to the number of connected components of the space $Hom(\pi_1(\Sigma),G)/G$ which can also be identified with the moduli space of gauge equivalence classes of flat G-bundles over $\Sigma$. We show that the same statement for a closed compact nonorientable surface which is homeomorphic to the connected sum of k copies of the real projective plane, where $k\neq 1,2,4$, can be easily derived from a result in A. Alekseev, A.Malkin and E. Meinrenken's recent work on Lie group valued moment maps.

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