Holomorphic families of non-equivalent embeddings and of holomorphic group actions on affine space

TL;DR

This paper constructs families of non-equivalent holomorphic embeddings and group actions on complex affine spaces, revealing new diversity in automorphism groups and actions that challenge previous assumptions in complex geometry.

Contribution

It introduces holomorphic families of embeddings and actions that are pairwise non-conjugate, advancing understanding of automorphism groups and the Holomorphic Linearization Problem.

Findings

Existence of non-equivalent holomorphic embeddings of ^k into ^n

Construction of non-conjugate holomorphic ^*-actions on ^n for n  5

Counterexamples to the uniqueness of conjugacy classes of ^*-actions

Abstract

We construct holomorphic families of proper holomorphic embeddings of $\C^k$ into $\C^n$ ($0<k<n-1$), so that for any two different parameters in the family no holomorphic automorphism of $\C^n$ can map the image of the corresponding two embeddings onto each other. As an application to the study of the group of holomorphic automorphisms of $\C^n$ we derive the existence of families of holomorphic $\C^*$-actions on $\C^n$ ($n\ge 5$) so that different actions in the family are not conjugate. This result is surprising in view of the long standing Holomorphic Linearization Problem, which in particular asked whether there would be more than one conjugacy class of $\C^*$ actions on $\C^n$ (with prescribed linear part at a fixed point).