Abstract
We show that every quasihyperbolic geodesic in a John space admitting a roughly starlike Gromov hyperbolic quasihyperbolization is a double cone arc. This result provides a new approach to an elementary metric geometry question, formulated by Heinonen (Quasiconformal mappings onto John domains. Rev Math Iberoam 5:97–123, 1989), which has been studied by Gehring et al. (Quasihyperbolic geodesics in John domains. Math Scand 36:75–92, 1989). As an application, we obtain a simple geometric condition connecting uniformity of a metric space with the existence of a Gromov hyperbolic quasihyperbolization.
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Acknowledgements
The authors are indebted to the anonymous referee for his/her remarks that helped to improve this manuscript. The first author was supported by NNSF of China (No. 11901090), the Department of Education of Guangdong Province, China (No. 2021KTSCX116), Guangdong–Hong Kong–Macao Intelligent Micro–Nano Optoelectronic Technology Joint Laboratory (Project No. 2020B1212030010), and the Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515110484). The second author was supported by Scientific Research Fund of Hunan Provincial Education Department (No. 20B118) and NSF of Hunan Province (No. 2021JJ30168). The second and the third authors were supported by NNSF of China (No. 11971124) and by NSF of Guangdong Province (No. 2021A1515010326).
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Zhou, Q., Li, Y. & Rasila, A. Gromov Hyperbolicity, John Spaces, and Quasihyperbolic Geodesics. J Geom Anal 32, 228 (2022). https://doi.org/10.1007/s12220-022-00968-2
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DOI: https://doi.org/10.1007/s12220-022-00968-2