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arXiv 0806.4121hep-thgr-qc
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三维量子几何与变形Poincare对称性

Three Dimensional Quantum Geometry and Deformed Poincare Symmetry

E. Joung, J. Mourad, K. Noui

摘要:

本文研究了在三维欧氏量子引力背景下出现的三维非对易空间。我们的出发点是假设等距群变形为Drinfeld double D(SU(2))。本文将平坦欧氏空间的构造推广到变形情形,即构造平坦欧氏空间的等距群ISU(2)与SU(2)的商。我们证明了函数代数成为SU(2)分布的非交换代数,赋予卷积积。这种构造给出了ISU(2)在代数上的作用,并允许确定平面波和坐标函数。特别是,我们表明:(i)平面波有界动量;(ii)到一个给定的动量相关联的几个SU(2)元素,导致一个元素在代数中的几个物理标量场的有效描述;(iii)他们的产品导致一个变形的附加规则的动量与频谱上的限制一致。我们将标量场的定域作用量推广到非对易情形。最后,利用调和分析,我们得到了矩阵代数的直和代数的另一个有用的描述。矩阵代数继承了ISU(2)的作用:旋转保持矩阵的阶不变,而平移以我们明确确定的方式改变阶。

英文摘要:

We study a three dimensional non-commutative space emerging in the context of three dimensional Euclidean quantum gravity. Our starting point is the assumption that the isometry group is deformed to the Drinfeld double D(SU(2)). We generalize to the deformed case the construction of the flat Euclidean space as the quotient of its isometry group ISU(2) by SU(2). We show that the algebra of functions becomes the non-commutative algebra of SU(2) distributions endowed with the convolution product. This construction gives the action of ISU(2) on the algebra and allows the determination of plane waves and coordinate functions. In particular, we show that: (i) plane waves have bounded momenta; (ii) to a given momentum are associated several SU(2) elements leading to an effective description of an element in the algebra in terms of several physical scalar fields; (iii) their product leads to a deformed addition rule of momenta consistent with the bound on the spectrum. We generalize to the non-commutative setting the local action for a scalar field. Finally, we obtain, using harmonic analysis, another useful description of the algebra as the direct sum of the algebra of matrices. The algebra of matrices inherits the action of ISU(2): rotations leave the order of the matrices invariant whereas translations change the order in a way we explicitly determine.

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