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Hyperbolic metrics on open subsests of Ptolemaic spaces with sharp parameter bounds

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 Added by Neil Katz
 Publication date 2020
  fields
and research's language is English
 Authors Neil N. Katz




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It is shown that a construction of Z. Zhang and Y. Xiao on open subsets of Ptolemaic spaces yields, when the subset has boundary containing at least two points, metrics that are Gromov hyperbolic with parameter $log 2$ and strongly hyperbolic with parameter $1$ with no further conditions on the open set. A class of examples is constructed on Hadamard manifolds showing these estimates of the parameters are sharp.



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