Journal of Functional Analysis ( IF 1.7 ) Pub Date : 2020-06-02 , DOI: 10.1016/j.jfa.2020.108664 S. Lord , F. Sukochev , D. Zanin
We connect finiteness of the noncommutative integral in Alain Connes' noncommutative geometry with the study of tensor multipliers from classical Banach space theory. For the Lorentz function space where , , denotes the decreasing rearrangement of f, and denotes the positive part of log on , we prove using tensor multipliers the formula Here is the selfadjoint extension of minus the Laplacian on , denotes the operation of pointwise multiplication, the operator has a bounded extension which is a compact operator from the Hilbert space to itself, and φ is any continuous normalised trace on the ideal of compact operators on with series of singular values at most logarithmically diverge. The formula fails given only , and previously had been shown by different methods for the smaller set of functions that have compact support.
We prove a similar formula for the Laplace-Beltrami operator on a compact Riemannian manifold without boundary.
We discuss how the integral formula incorporates a last theorem of Nigel Kalton. We also extend to the case a classical result of Cwikel on weak estimates of operators of the form , , where ∇ is the gradient operator.
中文翻译:
Kalton的最后定理和Connes积分的有限性
我们将Alain Connes非交换几何中非交换积分的有限性与经典Banach空间理论中的张量乘子的研究联系起来。对于洛伦兹函数空间 哪里 , ,表示f的递减重排,以及 表示登录的积极部分 ,我们证明使用张量乘法器的公式 这里 是减去拉普拉斯算子上的自伴扩展 , 表示逐点乘法运算,运算符 有一个有界扩展,它是希尔伯特空间的一个紧凑算符 本身,而φ是理想紧致算符上的任何连续归一化迹与一系列奇异值最多在对数上发散。该公式仅给出失败,并且先前已通过不同的方法针对较小的功能集进行了展示 具有紧凑的支持。
我们在无边界的紧凑黎曼流形上证明了Laplace-Beltrami算子的相似公式。
我们讨论积分公式如何结合Nigel Kalton的最后一个定理。我们还扩展到案例 Cwikel关于弱估计的经典结果 形式的运算符 , , ∇是梯度算子。