The Quantum-Field Approach to Superconductivity Theory

2016 ◽  
Vol 4 (2) ◽  
pp. 117-144 ◽  
Author(s):  
S. P. Kruchinin
Keyword(s):  
Quantum Field ◽  
Field Approach ◽  
Superconductivity Theory

MESON-DIQUARK LOOP EXPANSION

1993 ◽  
Vol 08 (02) ◽  
pp. 277-300 ◽  
Author(s):  
M. LUTZ ◽  
J. PRASCHIFKA
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Effective Action ◽  
Degrees Of Freedom ◽  
Auxiliary Field ◽  
Quantum Field ◽  
Field Approach ◽  
Loop Expansion ◽  
Quark Models

We consider a general (nonlocal) four-fermion quantum field theory and show how the Cornwall-Jackiw-Tomboulis effective action can be systematically expanded in the number, η, of composite, bose loops. This is achieved by the introduction of auxiliary, bilocal fields which describe fermion-fermion and fermion-antifermion correlations. The η expansion can be understood as a generalization of the [Formula: see text] expansion and is of particular interest in quark models, for example, where the bilocal fields can be identified with meson and diquark degrees of freedom. Comparison with the usual loop (ħ) expansion reveals some unusual characteristics of the η expansion and throws light on recent studies of diquark degrees of freedom in which the auxiliary field approach is used.

Quantum field approach to a low-density electron system

1991 ◽  
Vol 3 (40) ◽  
pp. 7763-7818 ◽  
Author(s):  
L G J van Dijk ◽  
G Vertogen
Keyword(s):  
Electron System ◽  
Low Density ◽  
Quantum Field ◽  
Field Approach

Quantum-Field Approach in Classical Physics and Geometrodynamics

2018 ◽  
Vol 61 (3) ◽  
pp. 566-578 ◽  
Author(s):  
V. V. Lasukov ◽  
M. O. Abdrashitova
Keyword(s):  
Quantum Field ◽  
Classical Physics ◽  
Field Approach

Full-Field Approach for Modeling of Microstructural Evolutions During Forming Processes

2019 ◽  
Author(s):  
S. Andrietti ◽  
M. Bernacki ◽  
N. Bozzolo ◽  
L. Maire ◽  
P. De Micheli ◽  
...  
Keyword(s):  
Full Field ◽  
Field Approach
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