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Dimension of divergence sets of oscillatory integrals with concave phase

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arxiv 2212.14330 v2 pith:DOBMSRTL submitted 2022-12-29 math.AP math.FA

classification math.APmath.FA
keywords dimensionconvergencepointwisesetswhenalongcaseconcave
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abstract

We study the Hausdorff dimension of the sets on which the pointwise convergence of the solutions to the fractional Schr\"odinger equation $e^{it(-\Delta)^\frac m2}f$ fails when $m\in(0,1)$ in one spatial dimension. The pointwise convergence along a non-tangential curve and a set of lines are also considered, where we find different nature from the case when $m\in(1,\infty)$.

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  1. Maximal estimates for orthonormal systems of wave equations with sharp regularity

    math.AP 2025-08 conditional novelty 7.0 of 10

    In d=3, the maximal estimate (1.8) is proved for all s > max{s_d(q), s_d(2β)}, confirming the conjecture; sharp β-ranges are also obtained for d≥4 and d=2.

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