含费米子的3D自旋泡沫量子引力中的观测值
Observables in 3d spinfoam quantum gravity with fermions
摘要：
研究了三维自旋泡沫量子引力与狄拉克费米子耦合系统中观测值的期望值。我们重新审视的模型介绍了作者之一，并将其扩展到无质量的费米子场的情况下。我们介绍了观测量，分析了它们的对称性和相应的规范固定。对费米子场进行Berezin积分，将费米子观测量展开到与纯量子引力观测量相关的开路径和闭环中。我们得到的规范不变的观测值的顶点振幅，而规范变化的观测值，如费米子传播子的期望值，给出了特定的自旋网络的评价。
英文摘要：
We study expectation values of observables in three-dimensional spinfoam quantum gravity coupled to Dirac fermions. We revisit the model introduced by one of the authors and extend it to the case of massless fermionic fields. We introduce observables, analyse their symmetries and the corresponding proper gauge fixing. The Berezin integral over the fermionic fields is performed and the fermionic observables are expanded in open paths and closed loops associated to pure quantum gravity observables. We obtain the vertex amplitudes for gauge-invariant observables, while the expectation values of gauge-variant observables, such as the fermion propagator, are given by the evaluation of particular spin networks.
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