caa a22 4500 465800998 CHVBK 20180323112052.0 cr unu---uuuuu 170327e19900601xx s 000 0 eng 10.1007/BF01290612 doi (NATIONALLICENCE)springer-10.1007/BF01290612 Truncation of time-dependent many-body theories [Elektronische Daten] [K. Schmitt, P. Reinhard, C. Toepffer] We investigate truncation schemes for the many-body dynamics of finite fermion systems beyond the time-dependent Hartree-Fock (TDHF) approximation. One approach starts from the quantum Bogolyubov-Born-Green-Kirkwood-Yvon (BBGKY-)hierarchy of equations of motion for density matrices. It is shown that simple truncation of higher correlations within this scheme is inconsistent because essential exchange correlations are lost. As an alternative, we study the (extended) exp(S) or coupled-cluster formalism. It provides a wider range of applicability. But it also runs into problems with non-unitary propagation after truncation. Springer-Verlag, 1990 05.45.+b nationallicence 03.65.Ca nationallicence 03.65.Sq nationallicence Schmitt K. Institut für Theoretische Physik, Universität Erlangen, Federal Republic of Germany aut Reinhard P. Institut für Theoretische Physik, Universität Erlangen, Federal Republic of Germany aut Toepffer C. Institut für Theoretische Physik, Universität Erlangen, Federal Republic of Germany aut Zeitschrift für Physik A Atomic Nuclei Springer-Verlag 336/2(1990-06-01), 123-131 0939-7922 336:2<123 1990 336 218 https://doi.org/10.1007/BF01290612 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF01290612 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Schmitt K. Institut für Theoretische Physik, Universität Erlangen, Federal Republic of Germany aut NATIONALLICENCE 700 1- Reinhard P. Institut für Theoretische Physik, Universität Erlangen, Federal Republic of Germany aut NATIONALLICENCE 700 1- Toepffer C. Institut für Theoretische Physik, Universität Erlangen, Federal Republic of Germany aut NATIONALLICENCE 773 0- Zeitschrift für Physik A Atomic Nuclei Springer-Verlag 336/2(1990-06-01), 123-131 0939-7922 336:2<123 1990 336 218 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer