信条
发表于 2025-3-28 17:23:34
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gerontocracy
发表于 2025-3-28 21:44:22
Cycles of the Transition Processes as Basic Idea of Ludwig Boltzmann,e k is momentum, r is coordinate, t is time, ё.is the particle energy, F is a force. The general form of the collision integral ... is:.Here Wkk’ and Wk’k probabilities of scattering k’ → k and k → k’. In the quantum case the . is slightly modified: the multipliers (1 ± f(k)) and (1 ± . appear befor
熔岩
发表于 2025-3-29 01:54:49
Systematics and Numerics in Many-Body Systems,h systems. However, only a single approximation, for example, the random phase approximation (RPA) does not necessarily give a correct physical result. It can be estimated, in many cases, using systematic approaches. This strategy is called “systematics”. This systematics requires almost automatical
诗集
发表于 2025-3-29 06:23:57
Multiphonon Excitations in Bose Films,aphite substrate. Undoubtedly the best . approximation to a complete theory of excitations in bulk .He is the Feynman theory.. At the heart of the Feynman theory is the assumption that the phonon-maxon-roton excitations are density fluctuations that have been excited out of the ground state. More ex
Cloudburst
发表于 2025-3-29 07:25:41
Theory of 3He Submonolayers in 4He Films,he impetus has been provided by electronic systems because of the intense interest in high temperature superconductivity and the quantum Hall effect. .He physically adsorbed into the surface of .He superfluid films provides an additional example of a strongly interacting many-fermion system in two-d
BRIBE
发表于 2025-3-29 14:22:33
Impurity Distribution in Helium Droplets,mit. They are therefore an excellent laboratory for the study of finite-size dependence of physical properties of a many-body system such as superfluidity or the excitation spectrum. However, despite many theoretical predictions concerning their ground and excited states (see Ref. . and references t
你敢命令
发表于 2025-3-29 16:38:55
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bizarre
发表于 2025-3-29 22:26:41
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啤酒
发表于 2025-3-30 00:18:58
Research of Appropriate Treatments of the Various Aspects of the Electron Correlation in Molecules the quantum chemists during the seventies and the eighties. The very last years have seen a major event with the sudden conversion of prominent pionneers in the molecular many-body problem to Density Functional approaches. One may quote J. Pople, who had made popular and developped the Rayleigh-Schr
phytochemicals
发表于 2025-3-30 04:14:31
A Coupled Cluster Approach to the Electron Correlation Problem Using a Correlated Reference State,osed shell systems.. Several generalizations to encompass multireference functions, leading to CC theories for open-shells, have been suggested in recent years. in the framework of effective hamiltonians, which have offered interesting possiblities of computing directly energy differences of spectro