Results 51 to 60 of about 566,000 (274)
High-precision calculation of the 4-loop QED contribution to the slope of the Dirac form factor
Physics Letters B, 2020 We have evaluated with 1100 digits of precision the contribution of all the 891 mass-independent 4-loop Feynman diagrams contributing to the slope of the Dirac form factor in QED.
Stefano Laporta
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Journal of High Energy Physics, 2023 A number of diagrammatic “cutting rules” have recently been developed for the wavefunction of the Universe which determines cosmological correlation functions. These leverage perturbative unitarity to relate particular “discontinuities” in Feynman-Witten
Santiago Agüí Salcedo, Scott Melville
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A Feynman diagram analyser DIANA—graphic facilities [PDF]
, 2000 New developments concerning the extension of the recently introduced (1) Feynman diagram analyser DIANA are presented.
J. Fleischer, M. Tentyukov
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Stochastic diagrams and Feynman diagrams [PDF]
Nuclear Physics B, 1985 Abstract We study the relationship between ordinary perturbation theory and perturbation theory obtained from stochastic quantization. We give a simple proof that, except in gauge theories, the several stochastic diagrams of a given topology are together equivalent to the corresponding Feynman diagram.
H. Hüffel, P.V. Landshoff
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Exact Solutions v.s. Perturbative Calculations of Finite Φ3-Φ4 Hybrid-Matrix-Model
Nuclear Physics B, 2023 There is a matrix model corresponding to a scalar field theory on noncommutative spaces called Grosse-Wulkenhaar model (Φ4 matrix model), which is renormalizable by adding a harmonic oscillator potential to scalar Φ4 theory on Moyal spaces.
Naoyuki Kanomata, Akifumi Sako
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Recursive method to obtain the parametric representation of a generic Feynman diagram [PDF]
, 2005 A recursive algebraic method which allows one to obtain the Feynman or Schwinger parametric representation of a generic $L$-loops and $(E+1)$ external lines diagram, in a scalar ${\ensuremath{\phi}}^{3}\ensuremath{\bigoplus}{\ensuremath{\phi}}^{4 ...
I. González, I. Schmidt
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Structure of light-front vacuum sector diagrams
Physics Letters B, 2019 We study the structure of scalar field light-front quantization vacuum graphs. In instant-time quantization both non-vacuum and vacuum graphs can equivalently be described by either the off-shell four-dimensional Feynman diagram approach or the on-shell ...
Philip D. Mannheim +2 more
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Description of processes passing at finite space and time intervals in the framework of QFT [PDF]
EPJ Web of Conferences, 2019 We consider a new approach to the description in the framework of QFT of processes passing at finite space and time intervals. The formalism is based on the Feynman diagram technique in the coordinate representation, in which the rules of passing to the ...
Egorov Vadim, Volobuev Igor
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Fast evaluation of Feynman diagrams [PDF]
Physical Review D, 2000 uses feynmp macros; v2 contains improved description of renormalization, plus other minor ...
Easther, Richard +2 more
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W pair production at lepton colliders in the Feynman-diagram gauge [PDF]
EPJ Web of ConferencesIn ref. [1], we calculated helicity amplitudes for e−e+ → W−W+ in the Feynman-diagram (FD) gauge analytically, and showed that the cross section can be understood by the individual γ, Z and ν amplitudes in the FD gauge.
Furusato Hiroyuki +3 more
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