On compact quotients of stratified groups, the number of δ-deep nodal domains and coarse zero-set features of sums of sub-Laplacian eigenfunctions grows polynomially in the eigenvalue bound, with arbitrarily small exponent loss.
On $C^0$-persistent homology and trees
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abstract
In this paper we give a metric construction of a tree which correctly identifies connected components of superlevel sets of $\mathbb{R}$-valued continuous functions $f$ on $X$ and show that it is possible to retrieve the $H_0$-persistent diagram from this tree. We revisit the notion of homological dimension previously introduced by Schweinhart and give some bounds for the latter in terms of the upper-box dimension of $X$, thereby partially answering a question of the same author. We prove a quantitative version of the Wasserstein stability theorem valid for regular enough $X$ and $\alpha$-H\"older functions and discuss some applications of this theory to random fields and the topology of their superlevel sets.
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Coarse nodal counts on sub-Riemannian manifolds
On compact quotients of stratified groups, the number of δ-deep nodal domains and coarse zero-set features of sums of sub-Laplacian eigenfunctions grows polynomially in the eigenvalue bound, with arbitrarily small exponent loss.