Flat forms, bi-Lipschitz parametrizations, and smoothability of manifolds

Details Flat forms, bi-Lipschitz parametrizations, and smoothability of manifolds Flat forms, bi-Lipschitz parametrizations, and smoothability of manifolds

2009-09-17

arxiv.org/abs/0909.3201v3

Mathematics

Metric Geometry

Scientific paper

We give a sufficient condition for a metric (homology) manifold to be locally bi-Lipschitz equivalent to an open subset in $\rn$. The condition is a Sobolev condition for a measurable coframe of flat 1-forms. In combination with an earlier work of D. Sullivan, our methods also yield an analytic characterization for smoothability of a Lipschitz manifold in terms of a Sobolev regularity for frames in a cotangent structure. In the proofs, we exploit the duality between flat chains and flat forms, and recently established differential analysis on metric measure spaces. When specialized to $\rn$, our result gives a kind of asymptotic and Lipschitz version of the measurable Riemann mapping theorem as suggested by Sullivan.

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