Ramanujan Cayley graphs on sporadic groups, By Shahram Mehry

Research

Title	Ramanujan Cayley graphs on sporadic groups
Type	JournalPaper
Keywords	sporadic group, character table, Cayley graph, eigenvalue
Year	2023
Journal	Journal of Discrete Mathematics and Its Applications
DOI
Researchers	Shahram Mehry

Abstract

Let Γ be a k−regular graph with the second maximum eigenvalue λ. Then Γ is said o be Ramanujan graph if λ ≤ 2 √ k − 1. Let G be a finite group and Γ = Cay(G,S) be a Cayley graph related to G. The aim of this paper is to investigate the Ramanujan Cayley graphs of sporadic groups.