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arXiv 1106.0261math-phgr-qchep-thmath.MP
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量子空间中的最小长度与非对易几何中线元的积分

Minimal length in quantum space and integrations of the line element in Noncommutative Geometry

Pierre Martinetti, Flavio Mercati, Luca Tomassini

摘要:

我们对量子时空中最小长度的出现提出质疑,并比较了文献中不同时期出现的两个概念:一方面,量子长度是在DFR量子时空和正则非对易时空中算符L的谱;另一方面,是在非对易几何中康纳斯的谱距离。虽然在欧氏空间上这两个概念合并成测地距离,但在非交换框架下它们产生不同的结果。特别是在Moyal平面上,量子长度从零开始有界,而光谱距离可以取任何实正值,包括无穷大。我们展示了如何解决这个矛盾的频谱三倍。这导致我们引入一个修正的量子长度d '_L,它与最佳局域化状态集上的光谱距离d_D完全一致。在量子谐振子的本征态集合上--连同它们的平移--d '_L和d_D在高能和大平移极限下渐近重合。在小能量下,我们把d ′_L和d_D之间的差异解释为量子空间中线元积分的两种不同方式。这使我们提出一个方程的Moyal平面上的测地线。

英文摘要:

We question the emergence of a minimal length in quantum spacetime, comparing two notions that appeared at various points in the literature: on the one side, the quantum length as the spectrum of an operator L in the Doplicher Fredenhagen Roberts (DFR) quantum spacetime, as well as in the canonical noncommutative spacetime; on the other side, Connes' spectral distance in noncommutative geometry. Although on the Euclidean space the two notions merge into the one of geodesic distance, they yield distinct results in the noncommutative framework. In particular on the Moyal plane, the quantum length is bounded above from zero while the spectral distance can take any real positive value, including infinity. We show how to solve this discrepancy by doubling the spectral triple. This leads us to introduce a modified quantum length d'_L, which coincides exactly with the spectral distance d_D on the set of states of optimal localization. On the set of eigenstates of the quantum harmonic oscillator - together with their translations - d'_L and d_D coincide asymptotically, both in the high energy and large translation limits. At small energy, we interpret the discrepancy between d'_L and d_D as two distinct ways of integrating the line element on a quantum space. This leads us to propose an equation for a geodesic on the Moyal plane.

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