Electronic Resource
Springer
The European physical journal
336 (1990), S. 123-131
ISSN:
1434-601X
Keywords:
05.45.+b
;
03.65.Ca
;
03.65.Sq
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01290612
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