Kähler-group conjecture for mapping class groups

For g3g\geq 3, let Modg{\rm Mod}_g be the mapping class group of a closed genus-gg surface. Kähler-group conjecture. The group Modg{\rm Mod}_g is a Kähler group, meaning that it is isomorphic to the fundamental group of a compact Kähler manifold. The source calls this a folklore conjecture and says it was not known there; the supplied status evidence records that it is now disproved, because finite extensions reduce to pure braid groups, which are iterated extensions of free groups and are not Kähler.

Sources & referencesView supporting material

Primary source

Benson Farb, “Some problems on mapping class groups and moduli space”, arXiv:math/0606432 (2006).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.