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In this article, we prove that a compact open set in the field $\mathbb{Q}_p$of $p$-adic numbers is a spectral set if and only if it tiles $\mathbb{Q}_p$ bytranslation, and also if and only if it is $p$-homogeneous which is easy tocheck. We also characterize spectral sets in $\mathbb{Z}/p^n \mathbb{Z}$ ($p\ge2$ prime, $n\ge 1$ integer) by tiling property and also by homogeneity.Moreover, we construct a class of singular spectral measures in $\mathbb{Q}_p$,some of which are self-similar measures.

Compact Open Spectral Sets In $\mathbb{Q}_p$