Equal-Time Commutators and Form Factors in Quantum Electrodynamics with Internal Symmetry

1969 ◽  
Vol 184 (5) ◽  
pp. 1577-1593 ◽  
Author(s):  
J. Katz ◽  
J. Langerholc
Keyword(s):  
Quantum Electrodynamics ◽  
Form Factors ◽  
Internal Symmetry ◽  
Equal Time

Form factors and equal-time commutators

1972 ◽  
Vol 12 (2) ◽  
pp. 387-408 ◽  
Author(s):  
T. C. Yang
Keyword(s):  
Form Factors ◽  
Equal Time

On the choice of form factors in non-local quantum electrodynamics

1972 ◽  
Vol 44 (2) ◽  
pp. 541-557 ◽  
Author(s):  
G.V. Efimov ◽  
O.A. Mogilevsky
Keyword(s):  
Quantum Electrodynamics ◽  
Form Factors ◽  
Local Quantum ◽  
Non Local

scholarly journals Mass sum rules of the electron in quantum electrodynamics

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
S. Rodini ◽  
A. Metz ◽  
B. Pasquini
Keyword(s):  
Quantum Electrodynamics ◽  
Rest Frame ◽  
Energy Momentum Tensor ◽  
Sum Rules ◽  
Form Factors ◽  
Momentum Tensor ◽  
Moving Frame ◽  
Nucleon Mass ◽  
Loop Order ◽  
The Masses

Abstract Different decompositions of the nucleon mass, in terms of the masses and energies of the underlying constituents, have been proposed in the literature. We explore the corresponding sum rules in quantum electrodynamics for an electron at one-loop order in perturbation theory. To this aim we compute the form factors of the energy-momentum tensor, by paying particular attention to the renormalization of ultraviolet divergences, operator mixing and scheme dependence. We clarify the expressions of all the proposed sum rules in the electron rest frame in terms of renormalized operators. Furthermore, we consider the same sum rules in a moving frame, where they become energy decompositions. Finally, we discuss some implications of our study on the mass sum rules for the nucleon.

scholarly journals Exact Green’s function of photon and medium effects in QED2+1

2020 ◽  
Vol 28 (2) ◽  
pp. 19-28
Author(s):  
S. Bannikov ◽  
V. Skalozub
Keyword(s):  
Green’S Function ◽  
Green's Function ◽  
Quantum Electrodynamics ◽  
Chemical Potential ◽  
Form Factors ◽  
Polarization Operator ◽  
Zero Temperature ◽  
Medium Effects ◽  
Longitudinal Modes ◽  
Debye Mass

In (2+1)­-dimensional Maxwell­-Chern­-Simons quantum electrodynamics, we derive the structure of the exact polarization operator in the presence of medium characterized by a chemical potential μ. We show that the transverse part of the operator is the sum of four tensors. These tensors and unit one form an algebra with respect to the commutation operation. Green’s function of photons at zero temperature is derived on the basis of calculations of the one­loop form factors. The spectrum of modes is investigated. We find that the transverse and longitudinal modes exist in medium. This result differs from that of other authors. Dependence of the photon Debye mass on the form factors is investigated and a static electric potential is calculated.

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