Summary
A method for the exact summation of the diagrams in the time-dependent perturbation series is applied to the derivation of the evolution equation for the homogeneous crystal. This equation is given as a sum over connected diagrams only.
Riassunto
Si applica un metodo per addizionare esattamente i diagrammi della serie di perturbazioni dipendenti dal tempo per derivare l’equazione dell’evoluzione di un cristallo omogeneo. Si dà questa equazione come sommatoria dei soli diagrammi connessi.
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References
L. Blum:Phys. of Fluids, to be published.
L. van Hove:Selected papers in quantum, statistics of interacting particles; Lectures given at the University of Washington, Seattle, Wash., 1958.
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Blum, L. The evolution equation for the homogeneous crystal. Nuovo Cim 24, 765–773 (1962). https://doi.org/10.1007/BF02751452
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DOI: https://doi.org/10.1007/BF02751452