On rational representations and rational group algebra of ${\mathrm{GL}}_2(q)$

Abstract

In this article, we study rational representations of $G={\mathrm{GL}}_2(q)$, where $q$ is a prime power. Let $\rho$ be an irreducible representation of $G$ over $\mathbb{Q}$. Then $\rho$ affords the character \[ Ω(χ)=m_{\mathbb{Q}}(χ)\sum_{σ\in\operatorname{Gal}(\mathbb{Q}(χ)/\mathbb{Q})}χ^σ, \] for some irreducible complex character $\chi$ of $G$, where $m_{\mathbb{Q}}(\chi )$ denotes the Schur index of $\chi$ over $\mathbb{Q}$, and conversely, every character of this form is afforded by an irreducible representation of $G$ over $\mathbb{Q}$. We obtain a combinatorial description for the counting of inequivalent irreducible $\mathbb{Q}$-representations of $G$ of each distinct degree. Furthermore, we briefly determine the rational character table of $G$ and present a method for constructing an irreducible rational matrix representation $\rho$ of $G$ affording the character $\Omega (\chi )$, where $\chi$ is an irreducible complex character of $G$ arising from parabolic induction. Finally, using the results on the rational representations of $G$, we derive an explicit combinatorial formula, depending only on $q$, for the Wedderburn decomposition of $\mathbb{Q}G$.