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arXiv 1507.07033hep-th
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世界线视角下的非对易U(1)规范理论

Noncommutative U(1) gauge theory from a worldline perspective

Naser Ahmadiniaz, Olindo Corradini, Daniela D'Ascanio, Sendic Estrada-Jimenez, Pablo Pisani

摘要:

研究了用相空间世界线路径积分表示单圈有效作用量的纯非对易U(1)规范理论。我们使用背景场方法写出二次作用量以保持明确的规范不变性,然后使用世界线形式主义写出单圈有效作用量,挑出UV发散部分和有限(平面和非平面)部分,并研究理论的重整化性质。这相当于对相空间路径积分采用世界线费曼规则,其很好地结合了Fadeev-Popov鬼贡献并有效地分离了平面和非平面贡献。我们还表明,有效的行动计算是独立的世界线格林函数的选择,这对应于一个特定的方式分解出粒子零模式。这允许采用同质弦启发的费曼规则,大大简化了计算。

英文摘要:

We study pure noncommutative U(1) gauge theory representing its one-loop effective action in terms of a phase space worldline path integral. We write the quadratic action using the background field method to keep explicit gauge invariance, and then employ the worldline formalism to write the one-loop effective action, singling out UV-divergent parts and finite (planar and non-planar) parts, and study renormalization properties of the theory. This amounts to employ worldline Feynman rules for the phase space path integral, that nicely incorporate the Fadeev-Popov ghost contribution and efficiently separate planar and non-planar contributions. We also show that the effective action calculation is independent of the choice of the worldline Green's function, that corresponds to a particular way of factoring out a particle zero-mode. This allows to employ homogeneous string-inspired Feynman rules that greatly simplify the computation.

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