Sharp $L^p$ estimates of powers of the complex Riesz transform

Math. Ann. 386 (2023), 1081-1125 Let $R_{1,2}$ be scalar Riesz transforms on $\mathbb{R}^2$. We prove that the $L^p$ norms of $k$-th powers of the operator $R_2+iR_1$ behave exactly as $|k|^{1-2/p}p$, uniformly in $k\in\mathbb{Z}\backslash\{0\}$, $p\geq2$. This gives a complete asymptotic answer to...

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Main Authors Carbonaro, Andrea, Dragičević, Oliver, Kovač, Vjekoslav
Format Journal Article
LanguageEnglish
Published 17.09.2021
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Abstract Math. Ann. 386 (2023), 1081-1125 Let $R_{1,2}$ be scalar Riesz transforms on $\mathbb{R}^2$. We prove that the $L^p$ norms of $k$-th powers of the operator $R_2+iR_1$ behave exactly as $|k|^{1-2/p}p$, uniformly in $k\in\mathbb{Z}\backslash\{0\}$, $p\geq2$. This gives a complete asymptotic answer to a question suggested by Iwaniec and Martin in 1996. The main novelty are the lower estimates, of which we give three different proofs. We also conjecture the exact value of $\|(R_2+iR_1)^k\|_p$. Furthermore, we establish the sharp behaviour of weak $(1,1)$ constants of $(R_2+iR_1)^k$ and an $L^\infty$ to $BMO$ estimate that is sharp up to a logarithmic factor.
AbstractList Math. Ann. 386 (2023), 1081-1125 Let $R_{1,2}$ be scalar Riesz transforms on $\mathbb{R}^2$. We prove that the $L^p$ norms of $k$-th powers of the operator $R_2+iR_1$ behave exactly as $|k|^{1-2/p}p$, uniformly in $k\in\mathbb{Z}\backslash\{0\}$, $p\geq2$. This gives a complete asymptotic answer to a question suggested by Iwaniec and Martin in 1996. The main novelty are the lower estimates, of which we give three different proofs. We also conjecture the exact value of $\|(R_2+iR_1)^k\|_p$. Furthermore, we establish the sharp behaviour of weak $(1,1)$ constants of $(R_2+iR_1)^k$ and an $L^\infty$ to $BMO$ estimate that is sharp up to a logarithmic factor.
Author Dragičević, Oliver
Carbonaro, Andrea
Kovač, Vjekoslav
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  surname: Kovač
  fullname: Kovač, Vjekoslav
BackLink https://doi.org/10.48550/arXiv.2109.08369$$DView paper in arXiv
https://doi.org/10.1007/s00208-022-02419-3$$DView published paper (Access to full text may be restricted)
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Snippet Math. Ann. 386 (2023), 1081-1125 Let $R_{1,2}$ be scalar Riesz transforms on $\mathbb{R}^2$. We prove that the $L^p$ norms of $k$-th powers of the operator...
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Title Sharp $L^p$ estimates of powers of the complex Riesz transform
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