Uniform homeomorphisms between spheres of unitarily invariant ideals

2023/05/11 by Javier Alejandro Chávez‐Domínguez, Chávez-Domínguez, Javier Alejandro
Mathematics · #46B20 #46L52 (Primary) 81P17 #46L52 46B80 #81P45 #94A17 (Secondary) #Advanced Banach Space Theory #Advanced Operator Algebra Research #Advanced Topology and Set Theory #FOS: Mathematics #Functional Analysis (math.FA) #Operator Algebras (math.OA) #Primary: 46B80

paper · pdf · doi:10.48550/arxiv.2305.07169

openalex publication_date 2023/05/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

The classical Mazur map is a uniform homeomorphism between the unit spheres of L_p spaces, and the version for noncommutative L_p spaces has the same property. Odell and Schlumprecht used two types of generalized Mazur maps to prove that the unit sphere of a Banach space X with an unconditional basis is uniformly homeomorphic to the unit sphere of a Hilbert space if and only if X does not contain ℓ_∞ⁿ's uniformly. We prove a noncommutative version of this result, yielding uniform homeomorphisms between spheres of unitarily invariant ideals, and along the way we study noncommutative versions of the aforementioned generalized Mazur maps: one based on the p-convexification procedure, and one based on the minimization of quantum relative entropy. The main result provides new examples of Banach spaces whose unit spheres are uniformly homeomorphic to the unit sphere of a Hilbert space (in fact, spaces with the property (H) of Kasparov and Yu).

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