Rate of convergence of Feynman approximations of semigroups generated by the oscillator Hamiltonian |
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Authors: | Yu N Orlov V Zh Sakbaev O G Smolyanov |
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Institution: | 1. Keldysh Institute of Applied Mathematics, RAS, Moscow, Russia 2. Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Oblast, Russia 3. Lomonosov Moscow State University, Moscow, Russia
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Abstract: | We determine the rate with which finitely multiple approximations in the Feynman formula converge to the exact expression for the equilibrium density operator of a harmonic oscillator in the linear ??-quantization. We obtain an explicit analytic expression for a finitely multiple approximation of the equilibrium density operator and the related Wigner function. We show that in the class of ??-quantizations, the equilibrium Wigner function of a harmonic oscillator is positive definite only in the case of the Weyl quantization. |
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