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Wick's Theorem for Spin Operators and Its Relation to the Coupled-Fermion Representation

✍ Scribed by Wang, Yung-Li


Book ID
120450352
Publisher
American Institute of Physics
Year
1966
Tongue
English
Weight
386 KB
Volume
37
Category
Article
ISSN
0021-8979

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## Abstract A modified form of Frenkel's time‐dependent variation principle, suggested by McLachlan for state vectors, is employed to discuss the optimal time evolution of a density operator ρ(__t__). An __ansatz__ is made for this operator such that __i__(__d__ρ/__dt__) = [__S__, ρ], where __S__(_