Curvature-direction measures of self-similar sets

Details Curvature-direction measures of self-similar sets Curvature-direction measures of self-similar sets

2011-11-18

arxiv.org/abs/1111.4457v1

Mathematics

Metric Geometry

16 pages, 2 figures

Scientific paper

We obtain fractal Lipschitz-Killing curvature-direction measures for a large class of self-similar sets F in R^d. Such measures jointly describe the distribution of normal vectors and localize curvature by analogues of the higher order mean curvatures of differentiable submanifolds. They decouple as independent products of the unit Hausdorff measure on F and a self-similar fibre measure on the sphere, which can be computed by an integral formula. The corresponding local density approach uses an ergodic dynamical system formed by extending the code space shift by a subgroup of the orthogonal group. We then give a remarkably simple proof for the resulting measure version under minimal assumptions.

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