Summary
A graphical method for the evaluation of vacuum expectation values of products of creation and annihilation operators, is presented. This method is an adaptation of Danos’ switchyard technique to the particular case of strings of only creation and annihilation operators and is easier to use and more transparent than Wick’s theorem.
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References
P. J. Brussaard andP. W. M. Glandemans:Shell Model Applications in Nuclear Spectro. scopy (Amsterdam, 1977).
M. Danos:Ann. Phys. (N.Y.),63, 319 (1971). See alsoM. Danos andV. Gillet: NBS Monograph no. 147 (1975) andM. Danos, V. Gillet andM. Cauvin:Methods in Relativistic Nuclear Physics (Amsterdam, 1982).
J. Eisbnbekg andW. Greiner:Microscopic Theory of the Nucleus, Vol. 3:Nuclear Theory (Amsterdam, 1972).
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On sabbatical leave of absence from the UniTerslty of Puerto Rico, Mayagüez, P.R. 00708.
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Delsanto, P.P. A graphical method to evaluate vacuum expectation values of products of creation and annihilation operators. Lett. Nuovo Cimento 37, 513–519 (1983). https://doi.org/10.1007/BF02751780
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DOI: https://doi.org/10.1007/BF02751780