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arXiv 0906.2902math.FAmath.SP
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纯态和混合态的谱密度和Sobolev不等式

Spectral density and Sobolev inequalities for pure and mixed states

Michel Rumin

摘要:

在不假设e^{-tA}是次马尔可夫的情况下,证明了关于给定超压缩谱衰减的正算子A的一些一般Sobolev型不等式及相关不等式.这些不等式不仅适用于函数,也适用于纯态,但也适用于混合态,即量子力学意义上的密度算符。这提供了域上Faber-Krahn型的普遍界,它适用于它们的整个Dirichlet谱分布,而不仅仅是第一特征值。另一个应用是将有限单纯复形覆盖的Novikov-Shubin数与l^{p,2}-上同调的挠率的消失联系起来.

英文摘要:

We prove some general Sobolev-type and related inequalities for positive operators A of given ultracontractive spectral decay, without assuming e^{-tA} is submarkovian. These inequalities hold on functions, or pure states, as usual, but also on mixed states, or density operators in the quantum mechanical sense. This provides universal bounds of Faber-Krahn type on domains, that apply to their whole Dirichlet spectrum distribution, not only the first eigenvalue. Another application is given to relate the Novikov-Shubin numbers of coverings of finite simplicial complexes to the vanishing of the torsion of some l^{p,2}-cohomology.

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