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arXiv 1208.6315hep-thmath-phmath.MPquant-ph
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(2+1)维的非对易性与Lorentz群

Noncommutativity in (2+1)-dimensions and the Lorentz group

H. Falomir, F. Vega, J. Gamboa, F. Méndez, M. Loewe

摘要:

在这篇文章中,我们考虑了粒子的模型生活在一个三维的时空与非标准的非交换性引起的移动正则坐标和动量与生成元的酉不可约表示的洛伦兹群。希尔伯特空间得到与表示空间的直积的结构,在这里我们能够构造实现洛伦兹变换代数的算子。本文研究了薛定谔和狄拉克粒子的修正朗道问题,其哈密顿量是通过对通常问题的动力学变量在正规空间中进行一种非阿贝尔的Bopp位移而得到的。这些模型的频谱被认为是在微扰理论,无论是小的和大的非交换性参数。我们发现没有约束的参数之间的坐标和动量的非交换性,但他们发挥类似的作用。由于酉不可约表示SL(2,R)的表示空间可以用平方可积函数的空间来实现,我们得出结论,这些模型等价于粒子生活在具有额外紧致维的空间中的量子力学模型。

英文摘要:

In this article we considered models of particles living in a three-dimensional space-time with a nonstandard noncommutativity induced by shifting canonical coordinates and momenta with generators of a unitary irreducible representation of the Lorentz group. The Hilbert space gets the structure of a direct product with the representation space, where we are able to construct operators which realize the algebra of Lorentz transformations. We study the modified Landau problem for both Schrödinger and Dirac particles, whose Hamiltonians are obtained through a kind of non-Abelian Bopp's shift of the dynamical variables from the ones of the usual problem in the normal space. The spectrum of these models are considered in perturbation theory, both for small and large noncommutativity parameters. We find no constraint between the parameters referring to no-commutativity in coordinates and momenta but they rather play similar roles. Since the representation space of the unitary irreducible representations SL(2,R) can be realized in terms of spaces of square-integrable functions, we conclude that these models are equivalent to quantum mechanical models of particles living in a space with an additional compact dimension.

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