On the upper tail problem for random hypergraphs
On the upper tail problem for random hypergraphs
复制标题
关于随机超图的上尾问题
DOI:
10.1002/rsa.20975
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发表时间:
2020
影响因子:
1
通讯作者:
Zhao, Yufei
中科院分区:
文献类型:
--
作者:
Liu, Yang P.;Zhao, Yufei
The upper tail problem in a random graph asks to estimate the probability that the number of copies of some fixed subgraph in an Erdős‐Rényi random graph exceeds its expectation by some constant factor. There has been much exciting recent progress on this problem. We study the corresponding problem for hypergraphs, for which less is known about the large deviation rate. We present new phenomena in upper tail large deviations for sparse random hypergraphs that are not seen in random graphs. We conjecture a formula for the large deviation rate, that is, the first order asymptotics of the log‐probability that the number of copies of fixed subgraphHin a sparse Erdős‐Rényi randomk‐uniform hypergraph exceeds its expectation by a constant factor. This conjecture turns out to be significantly more intricate compared to the case for graphs. We verify our conjecture when the fixed subgraphHbeing counted is a clique, as well as whenHis the 3‐uniform 6‐vertex 4‐edge hypergraph consisting of alternating faces of an octahedron, where new techniques are required.
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