Non-commutative branched covers and bundle unitarizability
Abstract
We prove that (a) the sections space of a continuous unital subhomogeneous bundle over compact metrizable admits a finite-index expectation onto , answering a question of Blanchard-Gogi\'{c} (in the metrizable case); (b) such expectations cannot, generally, have ``optimal index'', answering negatively a variant of the same question; and (c) a homogeneous continuous Banach bundle over a locally paracompact base space can be renormed into a Hilbert bundle in such a manner that the original space of bounded sections is -linearly Banach-Mazur-close to the resulting Hilbert module over the algebra of continuous bounded functions on . This last result resolves quantitatively another problem posed by Gogi\'{c}.
Cite
@article{arxiv.2409.03531,
title = {Non-commutative branched covers and bundle unitarizability},
author = {Alexandru Chirvasitu},
journal= {arXiv preprint arXiv:2409.03531},
year = {2025}
}
Comments
v2 amends the statement of Proposition 2.8 and adds Remark 2.9; 17 pages + references