A NEW FIELD-THEORETIC PATH INTEGRAL FOR OUT-OF-EQUILIBRIUM MATTER

An isolated statistical many-particle system, formed by relativistic neutral spinless massive bosons, is considered as a model of Out-of-Equilibrium Relativistic Quantum Field Theory. A possible initial non-equilibrium state (ρ_Q,in) for it is studied. Arguments are given to justify that ρ_Q,in generates the same ultraviolet behaviour as the renormalized correlation functions do in standard Equilibrium Thermal Field Theory. The time evolution of the system, as determined by ρ_Q,in, is discussed shortly.