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hep-ph2004
The 2 - particle irreducible effective action in gauge theories
E. Calzetta
The goal of this paper is to develop the formalism of the two-particle irreducible (2PI) \cite{LW61} (or Cornwall - Jackiw - Tomboulis (CJT) \cite {CJT}) effective action (EA) in a…
hep-ph2003
Correlation Entropy of an Interacting Quantum Field and H-theorem for the O(N) Model
E. A. Calzetta, B. L. Hu
Following the paradigm of Boltzmann-BBGKY we propose a correlation entropy (of the nth order) for an interacting quantum field, obtained by `slaving' (truncation with causal factor…