Applying the time-dependent variational principle of Balian and Ve ne roni, we derive variational approximations for multi-time correlation functions in 8 4 field theory. We assume first that the initial state is given and characterized by a density operator equal to a Gaussian density matrix. Then,
Effective-field approximations for memory functions in simple liquids
β Scribed by N.M. Hoang; L. Bonamy
- Publisher
- Elsevier Science
- Year
- 1972
- Tongue
- English
- Weight
- 428 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
Various recent models for the dynamic structure factor obtained in the frame of the linear response theory and the memory fmxtion formalism are reviewed and mathematically connected. This comparison su=ests a new model.
which ieads to a good ngzeement with the molecular dynamics data for liquid nrgon.
π SIMILAR VOLUMES
We consider a simple closure for the contmued-Iracnon expansion of the \lbra:lonal correlation function IX contams no adJustable parameters. yet shows remarkable agreement w~tb expenmental data lor some molecules m the hquld phase
Euclidean quantum field theory and statistical mechanical models are considered which have been analyzed using renormalization group methods generating inductively a sequence of effective actions. We present a simple method for obtaining correlation functions directly from the effective actions. We