An Lp Version of Raeburn's Symmetric Imprimitivity Theorem
Abstract
Let 1≤ p<∞. We prove an Lp-operator analogue of Raeburn's symmetric imprimitivity theorem for countable discrete groups. Let A be an Lp-operator algebra with a contractive two-sided approximate identity, admitting a nondegenerate isometric representation on a σ-finite Lp-space. Given commuting free and proper actions of groups G and H on a second-countable locally compact Hausdorff space Z, together with commuting isometric actions on A, we show that the two corresponding full crossed products, and likewise the two reduced crossed products, are Morita equivalent as Banach algebras. The proof is organized through the linking groupoid. Its main analytic ingredient is a coefficient-valued spatial matrix dilation; in the reduced case we prove that this dilation preserves regularity after a Borel reindexing of the opposite corner. A pairing-valued approximate identity yields fullness and nondegeneracy.
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BibTeX
@misc{chung2026version,
title = {{An $L^p$ Version of Raeburn's Symmetric Imprimitivity Theorem}},
author = {Yeong Chyuan Chung},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.36677},
eprint = {2610.36677},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.36677},
}
RIS
TY - UNPB
TI - An L^p Version of Raeburn's Symmetric Imprimitivity Theorem
AU - Yeong Chyuan Chung
PY - 2026
DA - 2026/10/27
PB - arXiv
DO - 10.48550/arxiv.2610.36677
UR - https://arxiv.org/abs/2610.36677
AB - Let 1≤ p<∞. We prove an L^p-operator analogue of Raeburn's symmetric imprimitivity theorem for countable discrete groups. Let A be an L^p-operator algebra with a contractive two-sided approximate identity, admitting a nondegenerate isometric representation on a σ-finite L^p-space. Given commuting free and proper actions of groups G and H on a second-countable locally compact Hausdorff space Z, together with commuting isometric actions on A, we show that the two corresponding full crossed products, and likewise the two reduced crossed products, are Morita equivalent as Banach algebras. The proof is organized through the linking groupoid. Its main analytic ingredient is a coefficient-valued spatial matrix dilation; in the reduced case we prove that this dilation preserves regularity after a Borel reindexing of the opposite corner. A pairing-valued approximate identity yields fullness and nondegeneracy.
ER -