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arXiv 1409.1206math.SPmath-phmath.FAmath.MP
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谱投影乘积的谱密度

The spectral density of a product of spectral projections

Rupert L. Frank, Alexander Pushnitski

摘要:

本文考虑谱投影的乘积$$ Π_ε(λ) = 1_{(-\infty,λ-ε)}(H_0) 1_{(λ+ε,\infty)}(H) 1_{(-\infty,λ-ε)}(H_0) $$,其中$H_0$和$H$分别是自由和扰动的短程薛定谔算子,$λ>0$是固定的,而$ε\to0$ .对于连续函数$f$在零附近足够快地消失,我们将$\mathrm{Tr}\ f(Π_ε(λ))$的渐近性的首项计算为$ε\to0$。我们的建设阐明了计算出现在“安德森的正交性灾难”的理论,并强调汉克尔运营商在这一现象中的作用。

英文摘要:

We consider the product of spectral projections $$ Π_ε(λ) = 1_{(-\infty,λ-ε)}(H_0) 1_{(λ+ε,\infty)}(H) 1_{(-\infty,λ-ε)}(H_0) $$ where $H_0$ and $H$ are the free and the perturbed Schrödinger operators with a short range potential, $λ>0$ is fixed and $ε\to0$. We compute the leading term of the asymptotics of $\mathrm{Tr}\ f(Π_ε(λ))$ as $ε\to0$ for continuous functions $f$ vanishing sufficiently fast near zero. Our construction elucidates calculations that appeared earlier in the theory of "Anderson's orthogonality catastrophe" and emphasizes the role of Hankel operators in this phenomenon.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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