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arXiv 0709.4347math.CA
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里斯变换在指数增长性李群上从H^1到L^1的有界性

Boundedness from H^1 to L^1 of Riesz transforms on a Lie group of exponential growth

Peter Sjögren, Maria Vallarino

摘要:

设$G$是由具有黎曼对称空间结构的$R^2$和$R^+$的半直积所给出的李群.设$X_0, X_1, X_2$是$G$的李代数的左不变向量场的一个区别基,定义了拉普拉斯算子$Δ=-(X_0^2+X_1^2+X_2^2)$ .本文考虑一阶里斯变换$R_i=X_iΔ^{-1/2}$和$S_i=Δ^{-1/2}X_i$,对于$i=0,1,2$ .我们证明了算子$R_i$,但不是$S_i$,是有界的Hardy空间$H^1$ $L^1$。我们还证明了二阶里斯变换$T_{ij}=X_iΔ^{-1}X_j$从$H^1$到$L^1$是有界的,而里斯变换$S_{ij}=Δ^{-1}X_iX_j$和$R_{ij}=X_iX_jΔ^{-1}$不是。

英文摘要:

Let $G$ be the Lie group given by the semidirect product of $R^2$ and $R^+$ endowed with the Riemannian symmetric space structure. Let $X_0, X_1, X_2$ be a distinguished basis of left-invariant vector fields of the Lie algebra of $G$ and define the Laplacian $Δ=-(X_0^2+X_1^2+X_2^2)$. In this paper we consider the first order Riesz transforms $R_i=X_iΔ^{-1/2}$ and $S_i=Δ^{-1/2}X_i$, for $i=0,1,2$. We prove that the operators $R_i$, but not the $S_i$, are bounded from the Hardy space $H^1$ to $L^1$. We also show that the second order Riesz transforms $T_{ij}=X_iΔ^{-1}X_j$ are bounded from $H^1$ to $L^1$, while the Riesz transforms $S_{ij}=Δ^{-1}X_iX_j$ and $R_{ij}=X_iX_jΔ^{-1}$ are not.

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