Comparison of invariant metrics and distances on strongly pseudoconvex domains and worm domains

摘要

We prove that for a strongly pseudoconvex domain D subset of Cn, the infinitesimal Caratheodory metric gC(z,v) and the infinitesimal Kobayashi metric gK(z,v) coincide if z is sufficiently close to bD and if v is sufficiently close to being tangential to bD. Also, we show that every two close points of D sufficiently close to the boundary and whose difference is almost tangential to bD can be joined by a (unique up to reparameterization) complex geodesic of D which is also a holomorphic retract of D. The same continues to hold if D is a worm domain, as long as the points are sufficiently close to a strongly pseudoconvex boundary point. We also show that a strongly pseudoconvex boundary point of a worm domain can be globally exposed; this has consequences for the behavior of the squeezing function.