Abstract
We discuss the -matrix interpretation of thermodynamics for the multiple production process. Two possible boundary conditions are considered. One of them is usual in a field theory vacuum boundary condition. The corresponding thermodynamics formalism can be used in particle physics. Another type assumes that the system under consideration is in the environment of black-body radiation. The latter leads to canonical thermodynamics. The comparison with Schwinger–Keldysh real-time finite-temperature field theory and with the nonstationary statistical operator approach of Zubarev are considered. The range of applicability of the finite-temperature description of the multiple production process is shown.
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