2-universality in Randomly Perturbed Graphs

2-universality in Randomly Perturbed Graphs
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2-随机扰动图中的普遍性

DOI:
10.1016/j.ejc.2020.103118
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发表时间:
2019
期刊:
Eur. J. Comb.
影响因子:
--
通讯作者:
Olaf Parczyk
Olaf Parczyk
中科院分区:
--
文献类型:
--
作者:
Olaf Parczyk

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一个图G称为图族F的泛图,如果它包含每个元素F∈ F作为一个子图。设F(n,2)是所有最大度为2的图的族. Ferber等人(2019)证明了存在一个C使得对于p≥ C(n− 2 scin 3 log 1 scin 3 n),随机图G(n,p)aas是F(n,2)-泛的,这是渐近最优的。对任意最小度δ(G α)≥ α n的n-顶点图G α,艾格纳和Brandt(1993)证明了:当α≥ 2 scin 3时,G α是F(n,2)-泛的(这是最优的)。本文考虑随机扰动图的模型,即并G α <$G(n,p).证明了aas G α <$G(n,p)是F(n,2)-泛的,只要α∈(0,1)且p= ω(n− 2 scin 3).这是渐进最优的,并且在相应参数中改进了上述两个结果。此外,这扩展了Böttcher等人的结果。(in press),他们在这些值处嵌入给定的F∈ F(n,2)。我们还证明了族F(n,2)的具有普适性的变体,即F(n,2)中围长至少为1/2的所有图.例如,存在一个只依赖于α的ε 0,使得对于所有ε ≥ ε 0,p= ω(1 scinn)对于F ε(n,2)-普适性已经是足够的。
A graph G is called universal for a family of graphs F if it contains every element F∈ F as a subgraph. Let F (n, 2) be the family of all graphs with maximum degree 2. Ferber et al.(2019) proved that there exists a C such that for p≥ C (n− 2∕ 3 log 1∕ 3 n) the random graph G (n, p) aas is F (n, 2)-universal, which is asymptotically optimal. For any n-vertex graph G α with minimum degree δ (G α)≥ α n Aigner and Brandt (1993) proved that G α is F (n, 2)-universal if α≥ 2∕ 3 (and this is optimal). In this note, we consider the model of randomly perturbed graphs, which is the union G α∪ G (n, p). We prove that aas G α∪ G (n, p) is F (n, 2)-universal provided that α∈(0, 1) and p= ω (n− 2∕ 3). This is asymptotically optimal and improves on both results from above in the respective parameter. Furthermore, this extends a result of Böttcher et al.(in press), who embed a given F∈ F (n, 2) at these values. We also prove variants with universality for the family F ℓ (n, 2), all graphs from F (n, 2) with girth at least ℓ. For example, there exists an ℓ 0 depending only on α such that for all ℓ≥ ℓ 0 already p= ω (1∕ n) is sufficient for F ℓ (n, 2)-universality.
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