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Blow-up of regular submanifolds in Heisenberg groups and applications

Valentino Magnani
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Abstract

We obtain a blow-up theorem for regular submanifolds in the Heisenberg group, where intrinsic dilations are used. Main consequence of this result is an explicit formula for the density of (p+1)-dimensional spherical Hausdorff measure restricted to a p-dimensional submanifold with respect to the Riemannian surface measure. We explicitly compute this formula in some simple examples and we present a lower semicontinuity result for the spherical Hausdorff measure with respect to the weak convergence of currents. Another application is the proof of an intrinsic coarea formula for vector-valued mappings on the Heisenberg group.

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Valentino Magnani. 2005-06-22. Blow-up of regular submanifolds in Heisenberg groups and applications. https://arxiv.org/abs/math/0506445

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