费米子投影的微扰描述：正规化、因果性和Furry定理
Perturbative Description of the Fermionic Projector: Normalization, Causality and Furry's Theorem
摘要：
用围道积分方法对费米子投影子进行了因果微扰展开。分析了不同的归一化条件。结果表明，相应的光锥展开是因果的意义上说，他们只涉及有界线积分。对于由此产生的循环图，我们证明了一个广义Furry定理。
英文摘要：
The causal perturbation expansion of the fermionic projector is performed with a contour integral method. Different normalization conditions are analyzed. It is shown that the corresponding light-cone expansions are causal in the sense that they only involve bounded line integrals. For the resulting loop diagrams we prove a generalized Furry theorem.
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