From the Von-Neumann Equation to the Quantum Boltzmann Equation in a Deterministic Framework |
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Authors: | F. Castella |
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Affiliation: | (1) CNRS et IRMAR, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France |
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Abstract: | In this paper, we investigate the rigorous convergence of the Density Matrix Equation (or Quantum Liouville Equation) towards the Quantum Boltzmann Equation (or Pauli Master Equation). We start from the Density Matrix Equation posed on a cubic box of size L with periodic boundary conditions, describing the quantum motion of a particle in the box subject to an external potential V. The physics motivates the introduction of a damping term acting on the off-diagonal part of the density matrix, with a characteristic damping time –1. Then, the convergence can be proved by letting successivelyL tend to infinity and to zero. The proof relies heavily on a lemma which allows to control some oscillatory integrals posed in large dimensional spaces. The present paper improves a previous announcement [CD]. |
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Keywords: | density matrix Liouville equation Pauli Master Equation time-dependent scattering theory Fermi's Golden Rule oscillatory integrals in large dimensions |
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