Minimal webs in Riemannian manifolds |
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Authors: | Steen Markvorsen |
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Institution: | (1) Department of Mathematics, Technical University of Denmark, Matematiktorvet, Building 303, 2800 Kgs. Lyngby, Denmark |
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Abstract: | For a given combinatorial graph G a geometrization (G, g) of the graph is obtained by considering each edge of the graph as a 1-dimensional manifold with an associated metric g. In this paper we are concerned with minimal isometric immersions of geometrized graphs (G, g) into Riemannian manifolds (N
n
, h). Such immersions we call minimal webs. They admit a natural ‘geometric’ extension of the intrinsic combinatorial discrete Laplacian. The geometric Laplacian on
minimal webs enjoys standard properties such as the maximum principle and the divergence theorems, which are of instrumental
importance for the applications. We apply these properties to show that minimal webs in ambient Riemannian spaces share several
analytic and geometric properties with their smooth (minimal submanifold) counterparts in such spaces. In particular we use
appropriate versions of the divergence theorems together with the comparison techniques for distance functions in Riemannian
geometry and obtain bounds for the first Dirichlet eigenvalues, the exit times and the capacities as well as isoperimetric
type inequalities for so-called extrinsic R-webs of minimal webs in ambient Riemannian manifolds with bounded curvature.
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Keywords: | Minimal immersions Locally finite countable graphs Extrinsic minimal R-webs Laplacian Eigenvalues Capacity Transience Isoperimetric inequalities Comparison theory |
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