scholarly journals Interpretation and resolution of pinch singularities in non-equilibrium quantum field theory

1999 ◽  
Vol 8 (3) ◽  
pp. 517-522 ◽  
Author(s):  
C. Greiner ◽  
S. Leupold
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Quantum Field ◽  
Non Equilibrium

scholarly journals Thermodynamic Properties of Non-equilibrium States in Quantum Field Theory

2002 ◽  
Vol 297 (2) ◽  
pp. 219-242 ◽  
Author(s):  
Detlev Buchholz ◽  
Izumi Ojima ◽  
Hansjörg Roos
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Thermodynamic Properties ◽  
Equilibrium States ◽  
Quantum Field ◽  
Non Equilibrium

Approach to non-equilibrium behaviour in quantum field theory

1989 ◽  
Vol 191 (2) ◽  
pp. 241-257 ◽  
Author(s):  
J Kripfganz ◽  
H Perlt
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Quantum Field ◽  
Non Equilibrium

scholarly journals Path Integral based Non-equilibrium Quantum Field Theory of Non-relativistic Pairs inside an Environment

2021 ◽  
Author(s):  
Tobias Binder
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Differential Equations ◽  
Path Integral ◽  
Quantum Electrodynamics ◽  
Relativistic Quantum ◽  
Einstein Condensation ◽  
Full Potential ◽  
Quantum Field ◽  
Non Equilibrium

Abstract We derive differential equations from path integral based non-equilibrium quantum field theory, that cover the dynamics and spectrum of non-relativistic two-body fields for any environment. For concreteness of the two-body fields, we choose the full potential non-relativistic Quantum Electrodynamics Lagrangian in this work. After closing the correlation function hierarchy of these differential equations and performing consistency checks with previous literature under certain limits, we demonstrate the range of physics applications. This includes Cosmology such as Dark Matter in the primordial plasma, Quarkonia Physics inside a quark-gluon plasma, and Condensed and strongly Correlated Matter Physics such as Bose-Einstein condensation or Superconductivity. Since we always had to take limits or approximations of our equations in order to recover those known cases, our equations could contain new phenomena. In particular they are based on non-equilibrium Green's function that can deal with non-hermite potentials as well as dynamical formation of different extreme phases. We propose a scheme for other Lagrangian based theories or higher N-body states such as molecules to derive analogous equations.

Non-equilibrium quantum field theory and perturbation theory

1995 ◽  
Vol 584 (4) ◽  
pp. 604-620 ◽  
Author(s):  
R. Fauser ◽  
H.H. Wolter
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Perturbation Theory ◽  
Quantum Field ◽  
Non Equilibrium
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