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arXiv · 2611.06581

A characterization of a family of integral Cayley graphs

Sauvik Poddar·Sucharita Biswas
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Abstract

Let $G$ be a finite group and $H$ be a subgroup of $G$. In our earlier work, we proved that the quasi-strongly regular Cayley graph $Γ_H(G)$ is integral whenever $H$ is normal in $G$, and raised the question of whether the converse also holds. In this paper, we answer this question affirmatively. We prove that if $Γ_H(G)$ is integral, then $H$ must be a normal subgroup of $G$. Consequently, $Γ_H(G)$ is integral if and only if $H\lhd G$. Our proof uses the irreducible representations of $G$ and the dimensions of their $H$-fixed subspaces. For a non-normal subgroup $H$, we construct a two-dimensional invariant subspace of a suitable representation operator and show that the corresponding eigenvalues are irrational.

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Sauvik Poddar, Sucharita Biswas. 2026-11-04. A characterization of a family of integral Cayley graphs. https://arxiv.org/abs/2611.06581

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