Regular Article – Theoretical Physics
Fermion and photon gap-equations in Minkowski space within the Nakanishi integral representation method
Istituto Nazionale di Fisica Nucleare, Sezione di Roma, P.le A. Moro 2, 00185, Rome, Italy
2 IRFU, CEA, Université Paris-Saclay, 91191, Gif-sur-Yvette, France
Accepted: 23 December 2020
Published online: 16 January 2021
The approach based on the Nakanishi integral representation of n-leg transition amplitudes is extended to the treatment of the self-energies of a fermion and an (IR-regulated) vector boson, in order to pave the way for constructing a comprehensive application of the technique to both gap- and Bethe-Salpeter equations, in Minkowski space. The achieved result, namely a 6-channel coupled system of integral equations, eventually allows one to determine the three Källén–Lehman weights for fully dressing the propagators of fermion and photon. A first consistency check is also provided. The presented formal elaboration points to embed the characteristics of the non-perturbative regime at a more fundamental level. It yields a viable tool in Minkowski space for the phenomenological investigation of strongly interacting theories, within a QFT framework where the dynamical ingredients are made transparent and under control.
© The Author(s) 2021
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