Renormalization flow of QED.
Renormalization flow of QED.
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QED 的重整化流程。
DOI：
10.1103/physrevlett.93.110405
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发表时间：
2004
影响因子：
8.6
通讯作者：
J. Jaeckel
中科院分区：
文献类型：
--
作者：
H. Gies;J. Jaeckel
我们在精确重整化群的框架下研究教科书上的QED。在强耦合区，我们研究了涨落引起的光子和费米子自相互作用对规范耦合非微扰运行的影响。我们的研究结果证实了琐碎的假设，完全电荷屏蔽，如果紫外截止发送到无穷大。虽然朗道极点不属于物理耦合域，由于自发的手征对称性破缺（chiSB），该理论预测的最大紫外扩展的规模相同的顺序作为朗道极点尺度。此外，我们验证了由轻费米子和Goldstone玻色子表征的理论的chiSB相位也具有平凡的Yukawa耦合。
We investigate textbook QED in the framework of the exact renormalization group. In the strong-coupling region, we study the influence of fluctuation-induced photonic and fermionic self-interactions on the nonperturbative running of the gauge coupling. Our findings confirm the triviality hypothesis of complete charge screening if the ultraviolet cutoff is sent to infinity. Though the Landau pole does not belong to the physical coupling domain owing to spontaneous chiral-symmetry-breaking (chiSB), the theory predicts a scale of maximal UV extension of the same order as the Landau pole scale. In addition, we verify that the chiSB phase of the theory which is characterized by a light fermion and a Goldstone boson also has a trivial Yukawa coupling.