## The least H-eigenvalue of adjacency tensor of hypergraphs with cut vertices

### Abstract

Let $G$ be a connected hypergraph with even uniformity, which contains cut vertices. Then $G$ is the coalescence of two nontrivial connected sub-hypergraphs (called branches) at a cut vertex. Let $\mathcal{A}(G)$ be the adjacency tensor of $G$. The least H-eigenvalue of $\mathcal{A}(G)$ refers to the least real eigenvalue of $\mathcal{A}(G)$ associated with a real eigenvector. In this paper we obtain a perturbation result on the least H-eigenvalue of $\mathcal{A}(G)$ when a branch of $G$ attached at one vertex is relocated to another vertex, and characterize the unique hypergraph whose least H-eigenvalue attains the minimum among all hypergraphs in a certain class of hypergraphs which contain a fixed connected hypergraph.Comment: arXiv admin note: substantial text overlap with arXiv:1902.0423

Topics: Mathematics - Combinatorics, Primary 15A18, 05C65, Secondary 13P15, 14M99
Year: 2020
OAI identifier: oai:arXiv.org:2002.10288

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