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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1002.4173hep-th
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自旋非对易性

Noncommutativity due to spin

M. Gomes, V. G. Kupriyanov, A. J. da Silva

摘要:

利用自旋粒子的Berezin-Marinov伪经典表述,我们提出了一个自旋非对易性的经典模型。在非相对论的情况下,坐标之间的泊松括号与自旋角动量成比例。模型的量子化导致了具有混合空间和自旋自由度的非对易性。修正的泡利方程,描述自旋半粒子的外电磁场。场获得。我们表明,非局域性所造成的自旋非对易性依赖于自旋的粒子;自旋为零,非局域性不会出现,自旋半,$ΔxΔy\geqθ^{2}/2$等,在相对论的情况下,非对易狄拉克方程的推导。为此,我们推出了一个新的明星产品。我们的模型的优点是,尽管存在非对易性和非局域性,它是洛伦兹不变的。此外,在拟经典近似下,它给出了具有幂零参数的非交换性。

英文摘要:

Using the Berezin-Marinov pseudoclassical formulation of spin particle we propose a classical model of spin noncommutativity. In the nonrelativistic case, the Poisson brackets between the coordinates are proportional to the spin angular momentum. The quantization of the model leads to the noncommutativity with mixed spacial and spin degrees of freedom. A modified Pauli equation, describing a spin half particle in an external e.m. field is obtained. We show that nonlocality caused by the spin noncommutativity depends on the spin of the particle; for spin zero, nonlocality does not appear, for spin half, $ΔxΔy\geqθ^{2}/2$, etc. In the relativistic case the noncommutative Dirac equation was derived. For that we introduce a new star product. The advantage of our model is that in spite of the presence of noncommutativity and nonlocality, it is Lorentz invariant. Also, in the quasiclassical approximation it gives noncommutativity with a nilpotent parameter.

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