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Some remarks on the Gehring-Hayman theorem

In this paper we provide new characterizations of the Gehring-Hayman theorem from the point of view of Gromov boundary and uniformity. We also determine the critical exponents for the uniformized space to be a uniform space in the case of the hyperbolic spaces, the model spaces $\mathbb{M}^κ_n$ of the sectional curvature $κ<0$ with the dimension $n \geq 2$ and hyperbolic fillings.