Quantum Electrodynamics of Čerenkov Radiation at Finite Temperature

被引:0
作者
E. B. Manoukian
D. Charuchittapan
机构
[1] Suranaree University of Technology,School of Physics
来源
International Journal of Theoretical Physics | 2000年 / 39卷
关键词
Radiation; Boundary Condition; Field Theory; Elementary Particle; Quantum Field Theory;
D O I
暂无
中图分类号
学科分类号
摘要
An exact, to order α, study of Čerenkov radiation in QEDis carried out at finitetemperatures T ≠ 0 in isotropic homogeneous media for the first time. By avoidingthe method of combining denominators of Feynman propagators in parametricform, which has led to approximations in the past due to the complexity of theresulting integrals, we use instead a complex integration method and automaticallyevaluate the h2ω2/E2contribution to the quantum power spectrum and settle theambiguity associated with this term which has been known to exist at T = 0.We show that complex integration over a so-called pinching singularity actuallysimplifies the problem tremendously over the usual method of combining thedenominators of the propagators. In particular, the imaginary part of the electronself-energy satisfies the correct underlying boundary condition and no contactterm is needed in its evaluation. QED, unlike its classical counterpart, introducesautomatically a cutoff for higher frequencies, emphasizing the importance of thequantum treatment.
引用
收藏
页码:2197 / 2206
页数:9
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