Holomorphic curves in complex spaces

Details Holomorphic curves in complex spaces Holomorphic curves in complex spaces

2006-04-05

arxiv.org/abs/math/0604118v3

Duke Math. J. 139 (2007), 203--254

Mathematics

Complex Variables

To appear in the Duke Mathematical Journal. (45 pages, 5 figures.)

Scientific paper

We study the existence of topologically closed complex curves normalized by bordered Riemann surfaces in complex spaces. Our main result is that such curves abound in any noncompact complex space admitting an exhaustion function whose Levi form has at least two positive eigenvalues at every point outside a compact set, and this condition is essential. The proof involves a lifting method for the boundary of the curve and a newly developed technique of gluing holomorphic sprays over Cartan pairs in Stein manifolds whose value lie in a complex space, with control up to the boundary of the domains. (The latter technique is also exploited in the subsequent papers math.CV/0607185 and math.CV/0609706.) We also prove that any compact complex curve with C^2 boundary in a complex space admits a basis of open Stein neighborhoods. In particular, an embedded disc of class C^2 with holomorphic interior in a complex manifold admits a basis of open polydisc neighborhoods.

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