Abstract
Let A be a 0-sectorial operator with a bounded \(H^\infty (\Sigma _\sigma )\)-calculus for some \(\sigma \in (0,\pi ),\) e.g. a Laplace type operator on \(L^p(\Omega ),\, 1< p < \infty ,\) where \(\Omega \) is a manifold or a graph. We show that A has a \(\mathcal {H}^\alpha _2(\mathbb {R}_+)\) Hörmander functional calculus if and only if certain operator families derived from the resolvent \((\lambda - A)^{-1},\) the semigroup \(e^{-zA},\) the wave operators \(e^{itA}\) or the imaginary powers \(A^{it}\) of A are R-bounded in an \(L^2\)-averaged sense. If X is an \(L^p(\Omega )\) space with \(1 \le p < \infty \), R-boundedness reduces to well-known estimates of square sums.
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We thank the anonymous referee for the careful reading of the manuscript.
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Communicated by Markus Haase.
The first named author acknowledges financial support from the Franco-German University (DFH-UFA) and the Karlsruhe House of Young Scientists (KHYS). The second named author acknowledges the support by the DFG through CRC 1173.
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Kriegler, C., Weis, L. Spectral multiplier theorems and averaged R-boundedness. Semigroup Forum 94, 260–296 (2017). https://doi.org/10.1007/s00233-017-9848-7
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DOI: https://doi.org/10.1007/s00233-017-9848-7