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Non-abelian local invariant cycles
Authors:Yen-lung Tsai  Eugene Z Xia
Institution:Department of Mathematical Sciences, National Chengchi University, Taipei 116, Taiwan ; Department of Mathematics, National Cheng Kung University, Tainan 701, Taiwan
Abstract:Let $ f$ be a degeneration of Kähler manifolds. The local invariant cycle theorem states that for a smooth fiber of the degeneration, any cohomology class, invariant under the monodromy action, comes from a global cohomology class. Instead of the classical cohomology, one may consider the non-abelian cohomology. This note demonstrates that the analogous non-abelian version of the local invariant cycle theorem does not hold if the first non-abelian cohomology is the moduli space (universal categorical quotient) of the representations of the fundamental group.

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