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arXiv · 2008.01031

Factors in randomly perturbed hypergraphs

Yulin Chang·Jie Han·Yoshiharu Kohayakawa·Patrick Morris·Guilherme Oliveira Mota
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Abstract

We determine, up to a multiplicative constant, the optimal number of random edges that need to be added to a $k$-graph $H$ with minimum vertex degree $\Omega(n^{k-1})$ to ensure an $F$-factor with high probability, for any $F$ that belongs to a certain class $\mathcal{F}$ of $k$-graphs, which includes, e.g., all $k$-partite $k$-graphs, $K_4^{(3)-}$ and the Fano plane. In particular, taking $F$ to be a single edge, this settles a problem of Krivelevich, Kwan and Sudakov [Combin. Probab. Comput. 25 (2016), 909--927]. We also address the case in which the host graph $H$ is not dense, indicating that starting from certain such $H$ is essentially the same as starting from an empty graph (namely, the purely random model).

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Yulin Chang, Jie Han, Yoshiharu Kohayakawa, Patrick Morris, Guilherme Oliveira Mota. 2020-08-03. Factors in randomly perturbed hypergraphs. https://arxiv.org/abs/2008.01031

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