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arXiv 1107.5002gr-qc
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复Ashtekar变量的扭相空间

Twistorial phase space for complex Ashtekar variables

Wolfgang M. Wieland

摘要:

我们将Dupuis,Freidel,Livine,Speziale和Tamarzino提出的扭转几何的SU(2)旋量框架推广到洛伦兹情形,即SL(2,C)群。我们表明,相空间的复值Ashtekar变量的自旋网络图可以分解的twistorial变量。每一个链接有两个扭曲-一个到每个边界点-重视。该方法为圈量子引力的简单性约束的解空间提供了一种新的推导。EPRL spinfoam模型的关键属性被完美地恢复。

英文摘要:

We generalise the SU(2) spinor framework of twisted geometries developed by Dupuis, Freidel, Livine, Speziale and Tambornino to the Lorentzian case, that is the group SL(2,C). We show that the phase space for complex valued Ashtekar variables on a spinnetwork graph can be decomposed in terms of twistorial variables. To every link there are two twistors---one to each boundary point---attached. The formalism provides a new derivation of the solution space of the simplicity constraints of loop quantum gravity. Key properties of the EPRL spinfoam model are perfectly recovered.

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