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arXiv 1201.6505hep-thgr-qc
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格点旋量引力中的几何和对称性

Geometry and symmetries in lattice spinor gravity

C. Wetterich

摘要:

格点旋量引力是一种基于费米子自由度的正则化量子引力。在我们的晶格模型中,局部洛仑兹对称性被推广到复杂的变换参数。空间和时间的区别不是先验的,欧氏和闵可夫斯基量子场论统一在一个泛函积分中。度规和它的签名是动力学的结果,对应于给定的基态或宇宙学解。几何对象,如维尔拜因,自旋连接或度规是由偶数个费米子建立的集体场的期望值。度规的量子有效作用量在连续极限的一般坐标变换下是不变的。我们的模型的行动被发现也是不变的规范变换。我们观察到一个“几何纠缠”的规范和洛伦兹变换由于几何对象变换非平凡下这两种类型的对称变换。

英文摘要:

Lattice spinor gravity is a proposal for regularized quantum gravity based on fermionic degrees of freedom. In our lattice model the local Lorentz symmetry is generalized to complex transformation parameters. The difference between space and time is not put in a priori, and the euclidean and Minkowski quantum field theory are unified in one functional integral. The metric and its signature arise as a result of the dynamics, corresponding to a given ground state or cosmological solution. Geometrical objects as the vierbein, spin connection or the metric are expectation values of collective fields built from an even number of fermions. The quantum effective action for the metric is invariant under general coordinate transformations in the continuum limit. The action of our model is found to be also invariant under gauge transformations. We observe a "geometrical entanglement" of gauge- and Lorentz-transformations due to geometrical objects transforming non-trivially under both types of symmetry transformations.

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