Cayley Graphs Without a Bounded Eigenbasis
Cayley Graphs Without a Bounded Eigenbasis
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没有有界本征基的凯莱图
DOI:
10.1093/imrn/rnaa298
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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:
Sah, Ashwin;Sawhney, Mehtaab;Zhao, Yufei
Does every-vertex Cayley graph have an orthonormal eigenbasis all of whose coordinates are? While the answer is yes for abelian groups, we show that it is no in general. On the other hand, we show that every-vertex Cayley graph (and more generally, vertex-transitive graph) has an orthonormal basis whose coordinates are all, and that this bound is nearly best possible. Our investigation is motivated by a question of Assaf Naor, who proved that random abelian Cayley graphs are small-set expanders, extending a classic result of Alon–Roichman. His proof relies on the existence of a bounded eigenbasis for abelian Cayley graphs, which we now know cannot hold for general groups. On the other hand, we navigate around this obstruction and extend Naor’s result to nonabelian groups.
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DOI:
10.19086/da.1294
发表时间:
2016
期刊:
arXiv: Combinatorics
影响因子:
--
作者:
D. Conlon;Yufei Zhao
通讯作者:
Yufei Zhao
影响因子:
2.5
作者:
B. Green
通讯作者:
B. Green
DOI:
10.1017/s0963548311000757
发表时间:
2010
期刊:
Combinatorics, Probability and Computing
影响因子:
--
作者:
A. Naor
通讯作者:
A. Naor
DOI:
10.1090/s0002-9947-1958-0100235-1
发表时间:
1958-02
影响因子:
1.3
作者:
R. Kunze
通讯作者:
R. Kunze