二维非测试条件的反例

C. Grigoriadis, M. Paparizos
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引用次数: 0

摘要

在证明一维中两个权值的局部$T_b$定理时,Sawyer, Shen和Uriarte-Tuero使用Hytonen的一个基本定理来处理相邻区间内测度的估计。Hytonen定理指出Hilbert变换的非检验条件由Muckenhoupt的$A_2$和$A^*_2$条件控制。因此,在尝试将两个权重$T_b$定理扩展到更高维度时,很自然地会问,是否存在Hytonen定理的更高维度类比,允许对相邻立方体上的度量项进行类似的控制。在本文中,我们表明,即使存在一维中使用的能量条件[SaShUT],情况也不是这样。因此,为了获得高维的局部$T_b$定理,有必要找到一些实质上的新参数来控制出了名的困难的邻近形式。更确切地说,我们证明了Hytonen对于两个权重分数积分和Riesz变换不等式的非检验条件不受Muckenhoupt的$A_2^\ α $和$A_2^{\ α,*}$条件和能量条件的控制。
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Counterexample to the off-testing condition in two dimensions
In proving the local $T_b$ Theorem for two weights in one dimension [SaShUT] Sawyer, Shen and Uriarte-Tuero used a basic theorem of Hytonen [Hy] to deal with estimates for measures living in adjacent intervals. Hytonen's theorem states that the off-testing condition for the Hilbert transform is controlled by the Muckenhoupt's $A_2$ and $A^*_2$ conditions. So in attempting to extend the two weight $T_b$ theorem to higher dimensions, it is natural to ask if a higher dimensional analogue of Hytonen's theorem holds that permits analogous control of terms involving measures that live on adjacent cubes. In this paper we show that it is not the case even in the presence of the energy conditions used in one dimension [SaShUT]. Thus, in order to obtain a local $T_b$ theorem in higher dimensions, it will be necessary to find some substantially new arguments to control the notoriously difficult nearby form. More precisely, we show that Hytonen's off-testing condition for the two weight fractional integral and the Riesz transform inequalities is not controlled by Muckenhoupt's $A_2^\alpha$ and $A_2^{\alpha,*}$ conditions and energy conditions.
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