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arXiv 1401.7102hep-thhep-ph
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多粒子过程和驯服的紫外发散

Multi-particle Processes and Tamed Ultraviolet Divergences

Victor Kim, Grigorii Pivovarov

摘要:

提出了一种计算可重整化量子场论中多粒子过程振幅的新方法。它的主要特点是重整化与计算分离。在建议的方法制定新的计算规则。根据新的规则,计算的振幅表示为有效费曼振幅之和,其顶点是不超过4个粒子的过程的完全振幅,线是完全的两点函数。新规则包括计算每个振幅的组合因子的处方。它表明,由于这些处方的组合因子的振幅是发散的紫外线在四个时空维度消失。因此,新方法中的计算不涉及紫外重整化。据观察,新规则的组合决定了时空的维度。

英文摘要:

New approach to computing the amplitudes of multi-particle processes in renormalizable quantum field theories is presented. Its major feature is a separation of the renormalization from the computation. Within the suggested approach new computational rules are formulated. According to the new rules, the amplitudes under computation are expressed as a sum of effective Feynman amplitudes whose vertexes are the complete amplitudes of the processes involving not more than four particles, and the lines are the complete two-point functions. The new rules include prescriptions for computing the combinatorial factors by each amplitude. It is demonstrated that due to these prescriptions the combinatorial factors by the amplitudes that are divergent in the ultraviolet in four space-time dimensions vanish. Because of this, the computations within the new approach do not involve the ultraviolet renormalization. It is observed that the combinatorics of the new rules determines the dimension of the space-time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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