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Let $G$ be a split connected reductive group, defined over $\mathbb{Z}$. Let$F$ and $F'$ be the non-archimedean $m$-close local fields, where $m$ is apositive integer. D.Kazhdan gave an isomorphism between the Hecke algebras${\rm Kaz}_m^F :\mathcal{H}\big(G(F),K_F\big) \rightarrow\mathcal{H}\big(G(F'),K_{F'}\big)$, where $K_F$ and $K_{F'}$ are the $m$-thusual congruence subgroups of $G(F)$ and $G(F')$ respectively. On the otherhand, if $\sigma$ is an automorphism of $G$ of prime order $l$, then we haveBrauer homomorphism ${\rmBr}:\mathcal{H}(G(F),U(F))\rightarrow\mathcal{H}(G^\sigma(F),U^\sigma(F))$,where $U(F)$ and $U^\sigma(F)$ are compact open subgroups of $G(F)$ and$G^\sigma(F)$ respectively. This article aims to study the compatibilitybetween these two maps in certain sense. Further, an application of thiscompatibility is given in the context of linkage--which is the representationtheoretic version of Brauer homomorphism.

Compatibility of Kazhdan and Brauer homomorphism