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arXiv · 2011.10333

BMO spaces of $\sigma$-finite von Neumann algebras and Fourier-Schur multipliers on $SU_q(2)$

Martijn Caspers·Gerrit Vos
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Abstract

We consider semi-group BMO spaces associated with an arbitrary $\sigma$-finite von Neumann algebra $(\mathcal{M}, \varphi)$. We prove that the associated row and column BMO spaces always admit a predual, extending results from the finite case. Consequently, we can prove that the semi-group BMO spaces considered are Banach spaces and they interpolate with $L_p$ as in the commutative situation, namely $[\mathrm{BMO}(\mathcal{M}), L_p^\circ(\mathcal{M})]_{1/q} \approx L_{pq}^\circ(\mathcal{M})$. We then study a new class of examples. We introduce the notion of Fourier-Schur multiplier on a compact quantum group and show that such multipliers naturally exist for $SU_q(2)$.

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BibTeXRIS

Martijn Caspers, Gerrit Vos. 2020-11-20. BMO spaces of $\sigma$-finite von Neumann algebras and Fourier-Schur multipliers on $SU_q(2)$. https://doi.org/10.4064/sm201202-18-6

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