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• W3168449899 abstract "We dwell upon certain points concerning the meaning of quantum field theory, among these the problems with the perturbative approach, and the question raised by tHooft of the existence of the theory in a well defined mathematical sense, as well as some of the few existent mathematically precise results on fully quantized field theories. Emphasis is brought on how the mathematical contributions help to elucidate or illuminate certain conceptual aspects of the theory when applied to real physical phenomena, in particular, the singular nature of quantum fields. In a first part, we present a comprehensive review of divergent versus asymptotic series, with qed as background example, as well as a method due to Terence Tao which conveys mathematical sense to divergent series. In a second part we apply the method of Tao to the Casimir effect in its simplest form, consisting of perfectly conducting parallel plates, arguing that the usual theory, which makes use of the Euler-MacLaurin formula, still contains a residual infinity, which is eliminated in our approach. In the third part, we revisit the general theory of nonperturbative quantum fields, in the form of newly proposed Wightman axioms for interacting field theories, together with Christian Jaekel. Applications to dressed electrons in a theory with massless particles, such as qed, as well as unstable particles, are included, and various problems (mostly open) are discussed in connection with concrete models." @default.
• W3168449899 created "2021-06-22" @default.
• W3168449899 creator A5043320124 @default.
• W3168449899 date "2021-01-11" @default.
• W3168449899 modified "2023-09-27" @default.
• W3168449899 title "Perturbative versus non-perturbative quantum field theory: the method of Tao, the Casimir effect and interacting Wightman theories" @default.
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