A New Approach to Quantum-Statistical Mechanics
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ID: 296645
1955
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Abstract
A new method of calculating the grand partition function of many-body system is developed, adopting extensively the techniques of calculus in quantum field theory. It is shown that the grand partition function, which is a trace of the density matrix expressed in terms of field operators, can be evaluated in a way almost parallel with the evaluation of the vacuum expectation value of the S-matrix in quantum field theory, provided that appropriate modifications in notation and definitions are made. As an example, the method is applied to electron-phonon system. Further, basing on this new formalism, various non-perturbational methods are discussed.
| Reference Key |
openalex_W1983598244
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|---|---|
| Authors | Takeo Matsubara |
| Journal | progress of theoretical physics |
| Year | 1955 |
| DOI |
10.1143/ptp.14.351
|
| URL | |
| Keywords | Keywords not found |
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