Approach to Equilibrium of A Large Fermion System
1960 年 15 巻 1 号 p. 78-92
詳細
1960 年 15 巻 1 号 p. 78-92
Using Feynman diagrams, the dissipative hehaviour of a large quantum system of many fermions is discussed. On the basis of linked cluster expansion of the time-dependent perturbation theory, the master equation is derived for the time sufficiently long compared to the effective collision time and for a slowly varying initial distribution in the momentum space. Van Hove’s result for weak coupling limit and the equation for low density limit are obtained as special cases.
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