By means of a summation procedure it is shown that, by assuming random a priori phases, the evolution equation for the density matrix operator consists only of connected diagrams. In the second part of the paper, a procedure to reduce sets of diagrams to more compact expressions is outlined; in particular the expression for the sum of all the diagrams with four lines is obtained.
| Documento: | Artículo |
| Título: | Evolution equation for homogeneous quantum fluids |
| Autor: | Blum, L. |
| Filiación: | Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina |
| Año: | 1963 |
| Volumen: | 81 |
| Número: | 6 |
| Página de inicio: | 1056 |
| Página de fin: | 1073 |
| DOI: | http://dx.doi.org/10.1088/0370-1328/81/6/311 |
| Título revista: | Proceedings of the Physical Society |
| ISSN: | 03701328 |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03701328_v81_n6_p1056_Blum |
