From spherical harmonics to a sharp multiplier theorem on the Grushin sphere

From spherical harmonics to a sharp multiplier theorem on the Grushin sphere
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从球谐函数到格鲁申球上的锐乘子定理

DOI:
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
Alessio Martini
Alessio Martini
中科院分区:
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文献类型:
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作者:
Valentina Casarino;P. Ciatti;Alessio Martini

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本文证明了$mathbb{R}^3$中单位球面上Grushin算子的Mihlin-H“ormander型尖锐乘子定理,以及相应的Bochner-Riesz平均的有界性结果.证明取决于球谐函数的精确逐点界限。
We prove a sharp multiplier theorem of Mihlin-H"ormander type for the Grushin operator on the unit sphere in $mathbb{R}^3$, and a corresponding boundedness result for the associated Bochner-Riesz means. The proof hinges on precise pointwise bounds for spherical harmonics.