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arXiv 1101.0502math.APmath-phmath.FAmath.MP
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R^3中波算子的结构

Structure of wave operators in R^3

Marius Beceanu

摘要:

在零既不是特征值也不是-Δ+ V的共振的假设下,我们证明了R^3中的波算子及其伴随的标度不变标量势类V的一个结构公式。该公式暗示了波算子在L^p空间、1 \leq p \leq \infty、加权L^p空间和索伯列夫空间上的有界性。以及e^{itH} P_c的多线性估计。当V在无穷远处迅速减小时,我们得到了波算子的一个渐近展开。展开式的首项是< y >^{-4}阶,与拉普拉斯算子交换,当V \in <x >^{-3/2-ε} L ^2时存在。我们还证明了散射算子S = W_-^* W_+是等距的可积组合。证明是基于一个抽象版本的维纳定理,适用于一个新的函数空间。

英文摘要:

We prove a structure formula for the wave operators in R^3 and their adjoints for a scaling-invariant class of scalar potentials V, under the assumption that zero is neither an eigenvalue, nor a resonance for -Δ+V. The formula implies the boundedness of wave operators on L^p spaces, 1 \leq p \leq \infty, on weighted L^p spaces, and on Sobolev spaces, as well as multilinear estimates for e^{itH} P_c. When V decreases rapidly at infinity, we obtain an asymptotic expansion of the wave operators. The first term of the expansion is of order < y >^{-4}, commutes with the Laplacian, and exists when V \in <x >^{-3/2-ε} L^2. We also prove that the scattering operator S = W_-^* W_+ is an integrable combination of isometries. The proof is based on an abstract version of Wiener's theorem, applied in a new function space.

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