mu-constant monodromy groups and marked singularities

Details mu-constant monodromy groups and marked singularities mu-constant monodromy groups and marked singularities

2011-08-02

arxiv.org/abs/1108.0546v1

Mathematics

Algebraic Geometry

38 pages

Scientific paper

mu-constant families of holomorphic function germs with isolated singularities are considered from a global perspective. First, a monodromy group from all families which contain a fixed singularity is studied. It consists of automorphisms of the Milnor lattice which respect not only the intersection form, but also the Seifert form and the monodromy. We conjecture that it contains all such automorphisms, modulo {id,-id}. Second, marked singularities are defined and global moduli spaces for right equivalence classes of them are established. The conjecture on the group would imply that these moduli spaces are connected. The relation with Torelli type problems is discussed and a new global Torelli type conjecture for marked singularities is formulated. All conjectures are proved for the simple and 22 of the 28 exceptional singularities.

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