A long ${\mathbb{C}}^2$ without holomorphic functions

Abstract

In this paper we construct for every integer $n>1$ a complex manifold of dimension $n$ which is exhausted by an increasing sequence of biholomorphic images of ${\mathbb{C}}^n$ (i.e., a long ${\mathbb{C}}^n$), but it does not admit any nonconstant holomorphic or plurisubharmonic functions. Furthermore, we introduce new biholomorphic invariants of a complex manifold $X$, the stable core and the strongly stable core, that are based on the long term behavior of hulls of compact sets with respect to an exhaustion of $X$. We show that every compact polynomially convex set $B\subset {\mathbb{C}}^n$ which is the closure of its interior is the strongly stable core of a long ${\mathbb{C}}^n$; in particular, biholomorphically nonequivalent sets give rise to nonequivalent long ${\mathbb{C}}^n$'s. Furthermore, for any open set $U\subset {\mathbb{C}}^n$ there exists a long ${\mathbb{C}}^n$ whose stable core is dense in $U$. It follows that for any $n>1$ there is a continuum of pairwise nonequivalent long ${\mathbb{C}}^n$'s with no nonconstant plurisubharmonic functions and no nontrivial holomorphic automorphisms. These results answer several long standing open problems.

To appear in Analysis & PDE

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