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On the Restriction to
${{\mathcal{D}}^{*}}\,\times \,{{\mathcal{D}}^{*}}$ of Representations of
$p$-adic
$G{{L}_{2}}(\mathcal{D})$
Published online by Cambridge University Press: 20 November 2018
Abstract
Let $\mathcal{D}$ be a division algebra over a nonarchimedean local field. Given an irreducible representation
$\pi $ of
$G{{L}_{2}}(\mathcal{D})$, we describe its restriction to the diagonal subgroup
${{\mathcal{D}}^{*}}\,\times \,{{\mathcal{D}}^{*}}$. The description is in terms of the structure of the twisted Jacquet module of the representation
$\pi $. The proof involves Kirillov theory that we have developed earlier in joint work with Dipendra Prasad. The main result on restriction also shows that
$\pi $ is
${{\mathcal{D}}^{*}}\,\times \,{{\mathcal{D}}^{*}}$-distinguished if and only if
$\pi $ admits a Shalika model. We further prove that if
$\mathcal{D}$ is a quaternion division algebra then the twisted Jacquet module is multiplicity-free by proving an appropriate theorem on invariant distributions; this then proves a multiplicity-one theorem on the restriction to
${{\mathcal{D}}^{*}}\,\times \,{{\mathcal{D}}^{*}}$ in the quaternionic case.
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- Copyright © Canadian Mathematical Society 2007
References
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