Abstract
In this paper, we will present two upper bounds for the length of a smallest “flower-shaped” geodesic net in terms of the volume and the diameter of a manifold. Minimal geodesic nets are critical points of the length functional on the space of graphs immersed into a Riemannian manifold. Let M n be a closed Riemannian manifold of dimension n. We prove that there exists a minimal geodesic net that consists of one vertex and at most 2n − 1 geodesic loops based at that vertex of total length ≤ 2n!d, where d is the diameter of M n. We also show that there exists a minimal geodesic net that consists of one vertex and at most \({3^{(n+1)^2}}\) loops of total length \({\leq2 (n+1)!^2 3^{(n+1)^3}\,Fill\,Rad\,M^n \leq2(n+1)!^{\frac{5}{2}}3^{(n+1)^3}(n+1)n^n vol(M^n)^{\frac{1}{n}}}\), where Fill Rad M n denotes the filling radius and vol(M n) denotes the volume of M n.
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Rotman, R. Flowers on Riemannian manifolds. Math. Z. 269, 543–554 (2011). https://doi.org/10.1007/s00209-010-0749-7
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DOI: https://doi.org/10.1007/s00209-010-0749-7