Lp bounds for Riesz transforms and square roots associated to second order elliptic operators

Lp bounds for Riesz transforms and square roots associated to second order elliptic operators
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DOI:
10.5565/publmat_47203_12
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发表时间:
2003-07
影响因子:
1.1
通讯作者:
S. Hofmann;J. M. Martell
S. Hofmann;J. M. Martell
中科院分区:
数学2区
文献类型:
--
作者:
S. Hofmann;J. M. Martell

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我们考虑 Riesz 变换 ∇L−1/2,其中 Leq−divA(x)∇,并且 A 是一个累加的 n × n 矩阵,具有在 Rn 上定义的有界可测量复数项。我们在 Lp(Rn) 上建立这些算子的有界性,范围为 pn < p ≤ 2,其中 pn = 2n/(n + 2),n ≥ 2,并且我们在端点 pn 处获得弱类型估计。 p = 2 的情况是已知的:它相当于 T. Kato 的平方根问题的解。
We consider the Riesz transforms ∇L−1/2, where L≡− divA(x)∇, and A is an accretive, n × n matrix with bounded measurable complex entries, defined on Rn. We establish boundedness of these operators on Lp(Rn), for the range pn < p ≤ 2, where pn = 2n/(n + 2), n ≥ 2, and we obtain a weak-type estimate at the endpoint pn. The case p = 2 was already known: it is equivalent to the solution of the square root problem of T. Kato.