Generalization of Mean-Field Approximations by the Feynman Inequality and Application to Long-Range Ising Chain
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概要
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Mean-field approximations such as molecular field approximation for spinsystem, Hartree-Fock approximation and BCS approximation for electronsystem are universally formulated by the Feynman inequality: -fi-" In Tr exp( - pH )< - p = ' In Tr exp ( - fiH.)) -I- Tr exp ( - pH.)(f - H.) /Tr exp ( - fiH.). Themethod of generalization of mean-field approximation is given. This is appliedto the problem of one-dimensional long-range Ising model.
- 社団法人日本物理学会の論文
- 1981-06-15
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