Abstract
We show that the recent techniques developed to study the Fourier restriction problem apply equally well to the Bochner–Riesz problem. This is achieved via applying a pseudo-conformal transformation and a two-parameter induction-on-scales argument. As a consequence, we improve the Bochner–Riesz problem to the best known range of the Fourier restriction problem in all high dimensions.
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Notes
It will be chosen to be \(R^{\delta '}\) for some extremely small \(\delta '\ll \epsilon \).
We refer to (7.22) for the explicit definition of \({\widetilde{{\mathbb {T}}}}_b'[B({\widetilde{{\textbf {x}}}}_0,\rho )]\).
We cannot directly apply the lemma because our operator is not of the normal form. However, one can prove the lemma for our operator by following the same argument. We leave out the details here.
The integers \(\#_{{\texttt {a} }}(j)\) and \( \#_{{\texttt {c} }}(j)\) indicate the number of occurrences of algebraic cases and cellular cases, respectively.
Possibly a tube \({\widetilde{T}}\) intersects \(N_{\rho _{j+1}^{1/2+\delta _m}/2}\big (Z+{\textbf {y}}_{O_j}+({\rho _{j+1}^{1/2+\delta _m}}/{2}) b \big )\) for many b. We simply choose one out of them.
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Acknowledgements
The authors would like to thank Xiaochun Li, Zane Li, Andreas Seeger, Rajula Srivastava and Terence Tao for valuable discussions. S.G. was supported in part by the NSF grant DMS-1800274. H.W. was supported by the National Science Foundation under Grant No. DMS-1926686. R.Z. was supported by the NSF grant DMS-1856541, DMS-1926686 and by the Ky Fan and Yu-Fen Fan Endowment Fund at the Institute for Advanced Study.
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Guo, S., Oh, C., Wang, H. et al. The Bochner–Riesz Problem: An Old Approach Revisited. Peking Math J (2024). https://doi.org/10.1007/s42543-023-00082-4
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DOI: https://doi.org/10.1007/s42543-023-00082-4