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Off-diagonal estimates for the first order commutators in higher dimensions
Journal of Functional Analysis ( IF 1.7 ) Pub Date : 2020-05-23 , DOI: 10.1016/j.jfa.2020.108652
Yaryong Heo , Sunggeum Hong , Chan Woo Yang

In this paper we study natural generalizations of the first order Calderón commutator in higher dimensions d2. We study the bilinear operator Tm which is given byTm(f,g)(x):=R2d[01m(ξ+tη)dt]fˆ(ξ)gˆ(η)e2πix(ξ+η)dξdη. Our results are obtained under two different conditions of the multiplier m. The first result is that when KSLloc1(Rd{0}) is a regular Calderón-Zygmund convolution kernel of regularity 0<δ1, TKˆ maps Lp(Rd)×Lq(Rd) into Lr(Rd) for all 1<p,q, 1r=1p+1q as long as r>dd+1. The second result is that when the multiplier mCd+1(Rd{0}) satisfies the Hörmander derivative conditions|ξαm(ξ)|Dα|ξ||α| for all ξ0, and for all multi-indices α with |α|d+1, Tm maps Lp(Rd)×Lq(Rd) into Lr(Rd) for all 1<p,q, 1r=1p+1q as long as r>dd+1. These two results are sharp except for the endpoint case r=dd+1. In case d=1 and K(x)=1/x, it is well-known that TKˆ maps Lp(R)×Lq(R) into Lr(R) for 1<p,q, 1r=1p+1q as long as r>1/2. In higher dimensional case d2, in 2016, when Kˆ(ξ)=ξj/|ξ|d+1 is the Riesz multiplier on Rd, P. W. Fong, in his Ph.D. Thesis [9], obtainedTKˆ(f,g)rCfpgq for 1<p,q as long as r>d/(d+1). As far as we know, except for this special case, there has been no general results for the off-diagonal case r<1 in higher dimensions d2. To establish our results we develop ideas of C. Muscalu and W. Schlag [18], [19] with new methods.



中文翻译:

高维一阶换向器的非对角线估计

在本文中,我们研究高阶一阶Calderón换向器的自然概括 d2。我们研究双线性算子ŤŤFGX=[R2d[01个ξ+ŤηdŤ]FˆξGˆηË2π一世Xξ+ηdξdη我们的结果是在乘数m的两个不同条件下获得的。第一个结果是,当ķ小号大号ØC1个[Rd{0} 是正则的常规Calderón-Zygmund卷积核 0<δ1个Ťķˆ 地图 大号p[Rd×大号q[Rd 进入 大号[R[Rd 对所有人 1个<pq1个[R=1个p+1个q 只要 [R>dd+1个。第二个结果是当乘数Cd+1个[Rd{0} 满足Hörmander导数条件|ξαξ|dα|ξ|-|α| 对所有人 ξ0,并为所有多指数α|α|d+1个Ť 地图 大号p[Rd×大号q[Rd 进入 大号[R[Rd 对所有人 1个<pq1个[R=1个p+1个q 只要 [R>dd+1个。除端点情况外,这两个结果都很清晰[R=dd+1个。以防万一d=1个ķX=1个/X众所周知 Ťķˆ 地图 大号p[R×大号q[R 进入 大号[R[R 对于 1个<pq1个[R=1个p+1个q 只要 [R>1个/2。在高维情况下d2,在2016年, ķˆξ=ξĴ/|ξ|d+1个 是Riesz乘数 [Rd,PW Fong,拥有博士学位 论文[9],获得ŤķˆFG[RCFpGq 对于 1个<pq 只要 [R>d/d+1个。据我们所知,除了这种特殊情况外,对角线情况没有任何一般结果[R<1个 在更高的尺寸 d2。为了建立我们的结果,我们用新方法开发了C. Muscalu和W. Schlag [18],[19]的想法。

更新日期:2020-05-23
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