An inverse problem in quantum field theory and canonical correlation functions

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  • HIROKAWA Masao
    Advanced Research Laboratory Hitachi Ltd. Department of Mathematics Faculty of Science Okayama University

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  • inverse problem in quantum field theory and canonical correlation functions
  • An application of a solvable model called the rotating wave approximation

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In this paper, we treat a quantum harmonic oscillator in thermal equilibrium with any systems in certain classes of bosons with infinitely many degrees of freedom. We describe the following results: (i) when a canonical correlation function is given, we so reconstruct a Hamiltonian by the rotating wave approximation from it that the Hamiltonian restores it. Namely, we solve an inverse problem in the quantum field theory at finite temperature in a finite volume. (ii) Taking an infinite volume limit for the result in (i), we consider long-time behavior of the canonical correlation function in the finite volume limit.

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