Steinerâ€™s formula in the Heisenberg group
Zoltán M. Balogh, Fausto Ferrari, Bruno Franchi, Eugenio Vecchi, Kevin Wildrick
Nonlinear Analysis: Theory, Methods & Applications
Steinerâ€™s tube formula states that the volume of an ÏµÏµ-neighborhood of a smooth regular domain in RnRn is a polynomial of degree nn in the variable ÏµÏµ whose coefficients are curvature integrals (also called quermassintegrals). We prove a similar result in the sub-Riemannian setting of the first Heisenberg group. In contrast to the Euclidean setting, we find that the volume of an ÏµÏµ-neighborhood with respect to the Heisenberg metric is an analytic function of ÏµÏµ that is generally not a polynomial. The coefficients of the series expansion can be explicitly written in terms of integrals of iteratively defined canonical polynomials of just five curvature terms.
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