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Singular integrals in quantum Euclidean spaces

About this Title

Adrían Manuel González-Pérez, Marius Junge and Javier Parcet

Publication: Memoirs of the American Mathematical Society
Publication Year: 2021; Volume 272, Number 1334
ISBNs: 978-1-4704-4937-7 (print); 978-1-4704-6750-0 (online)
DOI: https://doi.org/10.1090/memo/1334
Published electronically: September 27, 2021
Keywords: Singular integral, pseudodifferential operator, quantum Euclidean space

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Table of Contents

Chapters

  • Introduction
  • 1. Quantum Euclidean spaces
  • 2. Calderón-Zygmund $L_p$ theory
  • 3. Pseudodifferential $L_p$ calculus
  • 4. $L_p$ regularity for elliptic PDEs
  • A. Noncommutative tori
  • B. BMO space theory in $\mathcal {R}_\Theta$

Abstract

We shall establish the core of singular integral theory and pseudodifferential calculus over the archetypal algebras of noncommutative geometry: quantum forms of Euclidean spaces and tori. Our results go beyond Connes’ pseudodifferential calculus for rotation algebras, thanks to a new form of Calderón-Zygmund theory over these spaces which crucially incorporates nonconvolution kernels. We deduce $L_p$-boundedness and Sobolev $p$-estimates for regular, exotic and forbidden symbols in the expected ranks. In the $L_2$ level both Calderón-Vaillancourt and Bourdaud theorems for exotic and forbidden symbols are also generalized to the quantum setting. As a basic application of our methods, we prove $L_p$-regularity of solutions for elliptic PDEs.

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