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题名: Gauge-invariant dynamical quantities of QED with decomposed gauge potentials
作者: Zhou, BH ;  Huang, YC
刊名: PHYSICAL REVIEW A
出版日期: 2011
卷号: 84, 期号:3, 页码:32505
关键词: SPIN
学科分类: Physics
通讯作者: Zhou, BH (reprint author), Beijing Univ Technol, Inst Theoret Phys, Beijing 100124, Peoples R China.
部门归属: [Zhou, Bao-Hua; Huang, Yong-Chang] Beijing Univ Technol, Inst Theoret Phys, Beijing 100124, Peoples R China; [Huang, Yong-Chang] CAS, Kavli Inst Theoret Phys China, Beijing 100080, Peoples R China; [Huang, Yong-Chang] CCAST World Lab, Beijing 100080, Peoples R China
英文摘要: We discover an inner structure of the QED system; i.e., by decomposing the gauge potential into two orthogonal components, we obtain a new expansion of the Lagrangian for the electron-photon system, from which, we realize the orthogonal decomposition of the canonical momentum conjugate to the gauge potential with the canonical momentum's two components conjugate to the gauge potential's two components, respectively. Using the new expansion of Lagrangian and by the general method of field theory, we naturally derive the gauge invariant separation of the angular momentum of the electron-photon system from Noether theorem, which is the rational one and has the simplest form in mathematics, compared with the other four versions of the angular momentum separation available in literature. We show that it is only the longitudinal component of the gauge potential that is contained in the orbital angular momentum of the electron, as Chen et al. have said. A similar gauge invariant separation of the momentum is given. The decomposed canonical Hamiltonian is derived, from which we construct the gauge invariant energy operator of the electron moving in the external field generated by a proton [Phys. Rev. A 82, 012107 (2010)], where we show that the form of the kinetic energy containing the longitudinal part of the gauge potential is due to the intrinsic requirement of the gauge invariance. Our method provides a new perspective to look on the nucleon spin crisis and indicates that this problem can be solved strictly and systematically.
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000294919000007
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14273
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Zhou, BH,Huang, YC. Gauge-invariant dynamical quantities of QED with decomposed gauge potentials[J]. PHYSICAL REVIEW A,2011,84(3):32505.
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