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On semi-classical limit of spatially homogeneous quantum Boltzmann equation: weak convergence. (English) Zbl 1469.82028

Summary: It is expected in physics that the homogeneous quantum Boltzmann equation with Fermi-Dirac or Bose-Einstein statistics and with Maxwell-Boltzmann operator (neglecting effect of the statistics) for the weak coupled gases will converge to the homogeneous Fokker-Planck-Landau equation as the Planck constant \(\hbar\) tends to zero. In this paper and the upcoming work (He et al. in On semi-classical limit of spatially homogeneous quantum Boltzmann equation: asymptotic expansion, preprint), we will provide a mathematical justification on this semi-classical limit. Key ingredients into the proofs are the new framework to catch the weak projection gradient, which is motivated by Villani (Arch Rational Mech Anal 143(3):273-307, 1998) to identify the \(H\)-solutions for Fokker-Planck-Landau equation, and the symmetric structure inside the cubic terms of the collision operators.

MSC:

82C40 Kinetic theory of gases in time-dependent statistical mechanics
82D05 Statistical mechanics of gases
35Q20 Boltzmann equations
35Q84 Fokker-Planck equations
76P05 Rarefied gas flows, Boltzmann equation in fluid mechanics
35R09 Integro-partial differential equations
45K05 Integro-partial differential equations

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