Spectral multiplier theorems for abstract harmonic oscillators on UMD lattices

Jan van Neerven; Pierre Portal; Himani Sharma

doi:10.5802/crmath.370

Functional analysis, Harmonic analysis

Spectral multiplier theorems for abstract harmonic oscillators on UMD lattices

Jan van Neerven ¹; Pierre Portal ² ; Himani Sharma ³

¹ Delft Institute of Applied Mathematics, Delft University of Technology, P.O. Box 5031, 2600 GA Delft, The Netherlands
² The Australian National University, Mathematical Sciences Institute, Hanna Neumann Building, Ngunnawal and Ngambri Country, Canberra ACT 2601, Australia
³ The Australian National University, Mathematical Sciences Institute, Hanna Neumann Building, Ngunnawal and Ngambri Country, Canberra ACT 2601, Australia.

Comptes Rendus. Mathématique, Volume 361 (2023), pp. 835-846.

Abstract

We consider operators acting on a UMD Banach lattice $X$ that have the same algebraic structure as the position and momentum operators associated with the harmonic oscillator $- \frac{1}{2} Δ + \frac{1}{2} {| x |}^{2}$ acting on $L^{2} (ℝ^{d})$ . More precisely, we consider abstract harmonic oscillators of the form $\frac{1}{2} \sum_{j = 1}^{d} (A_{j}^{2} + B_{j}^{2})$ for tuples of operators $A = {(A_{j})}_{j = 1}^{d}$ and $B = {(B_{k})}_{k = 1}^{d}$ , where $i A_{j}$ and $i B_{k}$ are assumed to generate $C_{0}$ groups and to satisfy the canonical commutator relations. We prove functional calculus results for these abstract harmonic oscillators that match classical Hörmander spectral multiplier estimates for the harmonic oscillator $- \frac{1}{2} Δ + \frac{1}{2} {| x |}^{2}$ on $L^{p} (ℝ^{d})$ . This covers situations where the underlying metric measure space is not doubling and the use of function spaces that are not particularly well suited to extrapolation arguments. For instance, as an application we treat the harmonic oscillator on mixed norm Bargmann–Fock spaces. Our approach is based on a transference principle for the Schrödinger representation of the Heisenberg group that allows us to reduce the problem to the study of the twisted Laplacian on the Bochner spaces $L^{2} (ℝ^{2 d}; X)$ . This can be seen as a generalisation of the Stone–von Neumann theorem to UMD lattices $X$ that are not Hilbert spaces.

Received: 2022-01-09
Accepted: 2022-04-23
Published online: 2023-07-18

DOI: 10.5802/crmath.370

Classification: 47A60, 42B15, 43A80, 47A13, 47D03, 47G30, 81S05
Mots-clés : spectral multipliers, harmonic oscillator, twisted convolutions, canonical commutation relations, Weyl pseudo-differential calculus, UMD spaces, transference, $H^\infty $-calculus, Hörmander calculus

Author's affiliations:

Jan van Neerven ¹; Pierre Portal ²; Himani Sharma ³

¹ Delft Institute of Applied Mathematics, Delft University of Technology, P.O. Box 5031, 2600 GA Delft, The Netherlands
² The Australian National University, Mathematical Sciences Institute, Hanna Neumann Building, Ngunnawal and Ngambri Country, Canberra ACT 2601, Australia
³ The Australian National University, Mathematical Sciences Institute, Hanna Neumann Building, Ngunnawal and Ngambri Country, Canberra ACT 2601, Australia.

License:

CC-BY 4.0

Copyrights: The authors retain unrestricted copyrights and publishing rights

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     author = {Jan van Neerven and Pierre Portal and Himani Sharma},
     title = {Spectral multiplier theorems for abstract harmonic oscillators on {UMD} lattices},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {835--846},
     publisher = {Acad\'emie des sciences, Paris},
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     year = {2023},
     doi = {10.5802/crmath.370},
     language = {en},
}

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Jan van Neerven; Pierre Portal; Himani Sharma. Spectral multiplier theorems for abstract harmonic oscillators on UMD lattices. Comptes Rendus. Mathématique, Volume 361 (2023), pp. 835-846. doi : 10.5802/crmath.370. https://comptes-rendus.academie-sciences.fr/mathematique/articles/10.5802/crmath.370/

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