Summary
The completeness of the spectrum of the translation generatorsPμ is investigated in the framework of the Gupta-Bleuler formalism of QED. From the self-adjointness ofPμ one concludes that the photon spectral function ϱμν is a measure. This latter property is proved in perturbation theory. The low-energy behaviour of ϱμν is exhibited.
Riassunto
Si studia la completezza dello spettro dei generatori di traslazionePμ nel contesto del formalismo di Gupta-Bleuler dell’elettrodinamica quantistica. Dal fatto chePμ è autoaggiunto si conclude che la funzione spettrale del fotone ϱμν è una misura. Si dimostra quest’ultima proprietà nella teoria delle perturbazioni. Si presenta il comportamento di bassa energia di ϱμν.
Реэюме
В рамках формалиэма Гупта-Блейлера квантовой злектродинамики исследуется полнота спектра трансляционных генераторовPμ. Иэ самосопряженностиPμ следует, что фотонная спектральная функция ϱμν является мерой. Укаэанное свойство докаэывается с помошью теории воэмушений. Приводится поведение ϱμν при ниэких знергиях.
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References
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Kühn, J. On the photon spectral function. Nuov Cim A 14, 52–64 (1973). https://doi.org/10.1007/BF02734602
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DOI: https://doi.org/10.1007/BF02734602