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arXiv 1902.00285math-phmath.MPquant-ph
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$SU(2)$ -粒子西格玛模型:球体$S^3$上粒子的动量空间量子化

$SU(2)$-particle sigma model: Momentum-space quantization of a particle on the sphere $S^3$

Julio Guerrero, Francisco F. López-Ruiz, Victor Aldaya

摘要:

我们利用完全基于对称性的非正则方法,对运动在$SU(2)$群流形,即三维球$S^{3}$上的无自旋粒子进行动量空间量子化.为了实现这一任务,需要非标准(接触)对称性,如前一篇文章中给出的配置空间量子化所示。动量空间表象中的希尔伯特空间原来是由四维亥姆霍兹方程的(振荡)解的子集组成的。最相关的结果是,位形空间和动量空间之间的标量积和广义傅里叶变换都明显偏离了天真地预期的表达式,前者现在表现出一个非平凡的内核,在二重积分下,追溯到相空间的非平凡拓扑,即使动量空间本身是平坦的。此外,动量空间本身直接表现为对称群的不可约表示的载体空间,傅里叶变换表现为两个酉不可约表示之间的酉等价。

英文摘要:

We perform the momentum-space quantization of a spin-less particle moving on the $SU(2)$ group manifold, that is, the three-dimensional sphere $S^{3}$, by using a non-canonical method entirely based on symmetry grounds. To achieve this task, non-standard (contact) symmetries are required as already shown in a previous article where the configuration-space quantization was given. The Hilbert space in the momentum space representation turns out to be made of a subset of (oscillatory) solutions of the Helmholtz equation in four dimensions. The most relevant result is the fact that both the scalar product and the generalized Fourier transform between configuration and momentum spaces deviate notably from the naively expected expressions, the former exhibiting now a non-trivial kernel, under a double integral, traced back to the non-trivial topology of the phase space, even though the momentum space as such is flat. In addition, momentum space itself appears directly as the carrier space of an irreducible representation of the symmetry group, and the Fourier transform as the unitary equivalence between two unitary irreducible representations.

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