Boundedness conjecture for geodesic nets on Riemannian manifolds

Let MM be a complete Riemannian manifold. For a geodesic net GG on MM, let LL be its total length, L~\widetilde L its adjusted length, DD its diameter, and nn the number of unbalanced vertices. The adjusted length is the sum over edges eie_i, parametrized by arclength, of the integrals of 1/inj(ei(s))1/\operatorname{inj}(e_i(s)), where inj\operatorname{inj} is the injectivity radius of MM. Boundedness conjecture for geodesic nets on Riemannian manifolds. There exists a function fMf_M, depending on MM but invariant under rescaling MM, such that the number of balanced vertices of GG does not exceed

fM(L~,LD,n).f_M\left(\widetilde L,\frac{L}{D},n\right).

In particular, if MM has injectivity radius inj>0\operatorname{inj}>0, then the number of balanced vertices does not exceed

fM(Linj,LD,n).f_M\left(\frac{L}{\operatorname{inj}},\frac{L}{D},n\right).

The adjustment accounts for collapsing injectivity radius, which gives counterexamples to unadjusted bounds on general manifolds. The conjecture remains open.

Sources & referencesView supporting material

Primary source

Alexander Nabutovsky and Fabian Parsch, “Geodesic Nets: Some Examples and Open Problems”, arXiv:1904.00483 (2019).

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