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arXiv 0806.2587gr-qchep-thmath-phmath.MP
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三维量子引力中的q形变与半二元论

q-Deformation and Semidualisation in 3d Quantum Gravity

S Majid, B J Schroers

摘要:

我们详细探讨了量子玻恩互易性或“半二元论”在欧几里得三维量子引力中的作用。后者是一个代数运算定义使用量子群的方法,交换位置和动量。利用这一点,我们能够澄清的有效的非交换几何结构之间的关系,已经讨论了三维重力的背景下。我们证明了在没有宇宙学常数的量子引力中,基于D(U(su_2))的自旋模型是三球空间中量子粒子的半对偶,而双交叉积(DSR)模型是双曲空间中量子粒子的半对偶.进一步证明了不同的模型都是q=e^{- \hbar \sqrt{-Λ} /m_p}的q变形模型的特定极限,其中m_p是普朗克质量,Λ是宇宙学常数,并论证了半二元论互换了m_p和l_c,其中l_c是宇宙学长度尺度l_c=1/ \sqrt{|Λ|} .我们通过研究表示论来研究半二元论的物理学。在这两个自旋模型和它的半对偶,我们表明,不可约表示有一个物理图片作为解决方案的一个分别的非交换/弯曲的波动方程。此外,我们解释说,q-变形模型,在一定的代数水平,是自对偶下semidualisation。

英文摘要:

We explore in detail the role in euclidean 3d quantum gravity of quantum Born reciprocity or `semidualisation'. The latter is an algebraic operation defined using quantum group methods that interchanges position and momentum. Using this we are able to clarify the structural relationships between the effective non-commutative geometries that have been discussed in the context of 3d gravity. We show that the spin model based on D(U(su_2)) for quantum gravity without cosmological constant is the semidual of a quantum particle on a three-sphere, while the bicrossproduct (DSR) model is the semidual of a quantum particle on hyperbolic space. We show further how the different models are all specific limits of q-deformed models with q=e^{-\hbar \sqrt{-Λ}/m_p}, where m_p is the Planck mass and Λis the cosmological constant, and argue that semidualisation interchanges m_p and l_c, where l_c is the cosmological length scale l_c=1/\sqrt{|Λ|}. We investigate the physics of semidualisation by studying representation theory. In both the spin model and its semidual we show that irreducible representations have a physical picture as solutions of a respectively non-commutative/curved wave equation. We explain, moreover, that the q-deformed model, at a certain algebraic level, is self-dual under semidualisation.

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