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arXiv 1609.01724math.DGmath-phmath.APmath.MPmath.SP
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非完备黎曼流形上的量子禁闭

Quantum confinement on non-complete Riemannian manifolds

Dario Prandi, Luca Rizzi, Marcello Seri

摘要:

考虑了非完备黎曼流形$M$上的量子完备性问题,即量子粒子的限制问题,该流形具有光滑测度$ω$,在$M$的度量边界附近可能退化或奇异,并且存在实值势$V\in L^2_{\mathrm{loc}}(M)$ .本文的主要优点是识别的内在量,有效势$V_{\mathrm{eff}}$,它允许制定简单的量子限制的标准。令$δ$为到$M$的可能非紧凑度量边界的距离。主要结果的一个简化形式保证了当$V\ge -cδ^2$远离度规边界和\[ V_{\mathrm{eff}}+V\ge \frac3{4δ^2}-\fracκδ, \qquad \text{close to the metric boundary}. \]时的量子完全性。这些准则使我们能够:(i)得到在$M$的度规边界附近具有简并或奇异性的测度的量子限制结果;(ii)将强奇异势的Kalf-Walter-Schmincke-Simon定理推广到任意维奇异性的黎曼情形;(iii)给出了第一个,据我们所知,Laplace-Beltrami算子自伴性的基于曲率的标准;(iv)在温和的正则性假设下,证明几乎黎曼几何中的Laplace-Beltrami算子本质上是自伴的,部分解决了在[Boscain,Laurent -Ann. Inst. Fourier,2013]中提出的猜想。

英文摘要:

We consider the quantum completeness problem, i.e. the problem of confining quantum particles, on a non-complete Riemannian manifold $M$ equipped with a smooth measure $ω$, possibly degenerate or singular near the metric boundary of $M$, and in presence of a real-valued potential $V\in L^2_{\mathrm{loc}}(M)$. The main merit of this paper is the identification of an intrinsic quantity, the effective potential $V_{\mathrm{eff}}$, which allows to formulate simple criteria for quantum confinement. Let $δ$ be the distance from the possibly non-compact metric boundary of $M$. A simplified version of the main result guarantees quantum completeness if $V\ge -cδ^2$ far from the metric boundary and \[ V_{\mathrm{eff}}+V\ge \frac3{4δ^2}-\fracκδ, \qquad \text{close to the metric boundary}. \] These criteria allow us to: (i) obtain quantum confinement results for measures with degeneracies or singularities near the metric boundary of $M$; (ii) generalize the Kalf-Walter-Schmincke-Simon Theorem for strongly singular potentials to the Riemannian setting for any dimension of the singularity; (iii) give the first, to our knowledge, curvature-based criteria for self-adjointness of the Laplace-Beltrami operator; (iv) prove, under mild regularity assumptions, that the Laplace-Beltrami operator in almost-Riemannian geometry is essentially self-adjoint, partially settling a conjecture formulated in [Boscain, Laurent - Ann. Inst. Fourier, 2013] .

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