The Moduli of Flat PU(p,p)-Structures with Large Toledo Invariants

Abstract

For a compact Riemann surface $X$ of genus $g>1$, $\Hom(π_1(X), PU(p,q))/PU(p,q)$ is the moduli space of flat $PU(p,q)$-connections on $X$. There are two invariants, the Chern class $c$ and the Toledo invariant $\tau$ associated with each element in the moduli. The Toledo invariant is bounded in the range $-2min(p,q)(g-1)\le \tau \le 2min(p,q)(g-1)$. This paper shows that the component, associated with a fixed $\tau >2(max(p,q)-1)(g-1)$ (resp. $\tau <-2(max(p,q)-1)(g-1)$) and a fixed Chern class $c$, is connected (The restriction on $\tau$ implies $p=q$).

16 pages