Conformal Grushin spaces

Author:

Romney Matthew

Abstract

We introduce a class of metrics on R n \mathbb {R}^n generalizing the classical Grushin plane. These are length metrics defined by the line element d s = d E ( , Y ) β d s E ds = d_E(\cdot ,Y)^{-\beta }ds_E for a closed nonempty subset Y R n Y \subset \mathbb {R}^n and β [ 0 , 1 ) \beta \in [0,1) . We prove, assuming a Hölder condition on the metric, that these spaces are quasisymmetrically equivalent to R n \mathbb {R}^n and can be embedded in some larger Euclidean space under a bi-Lipschitz map. Our main tool is an embedding characterization due to Seo, which we strengthen by removing the hypothesis of uniform perfectness. In the two-dimensional case, we give another proof of bi-Lipschitz embeddability based on growth bounds on sectional curvature.

Publisher

American Mathematical Society (AMS)

Subject

Geometry and Topology

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