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arXiv 0906.3837hep-th
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弯曲空间QED中光子传播子的单圈修正

One-loop corrections to the photon propagator in the curved-space QED

Bruno Gonçalves, Guilherme de Berredo-Peixoto, Ilya L. Shapiro

摘要:

计算并讨论了量子电动力学中光子与背景引力场相互作用的单圈修正。在高能时,费米子场可视为无质量场,量子项可通过共形反常积分得到。我们提出了一个相应的有效作用量的协变局部表达式,类似于前面得到的引力扇区。在中等能量下,量子项可以通过热核方法得到。用这种方法,我们导出了在动量相减方案中电荷的精确单圈β函数,并探索了无质量和大质量的极限。这两种方法之间的关系示出和讨论的差异,在宇宙学和天体物理学的可能应用。

英文摘要:

We calculate and discuss the one-loop corrections to the photon sector of QED interacting to a background gravitational field. At high energies the fermion field can be taken as massless and the quantum terms can be obtained by integrating conformal anomaly. We present a covariant local expression for the corresponding effective action, similar to the one obtained earlier for the gravitational sector. At the moderate energies the quantum terms can be obtained through the heat kernel method. In this way we derive the exact one-loop beta-function for the electric charge in the momentum subtraction scheme and explore both massless and large mass limits. The relation between the two approaches is shown and the difference discussed in view of the possible applications to cosmology and astrophysics.

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