The cluster-expansion approach is a technique in quantum mechanics that systematically truncates the BBGKY hierarchy problem that arises when quantum dynamics...

correlations, that can be treated systematically, e.g., with the cluster-expansion approach. At this level, one can explain and predict a wide range of effects...

published on 31 December 1946. Fokker–Planck equation Vlasov equation Cluster-expansion approach Harold Grad (1949). On the kinetic theory of rarefied gases. Communications...

and Computational Approaches to the Electronic Structure of Molecules. p. 127. Nakatsuji, H.; Hirao, K. (1977). "Cluster expansion of the wavefunction...

inlining just a proper subset of the cluster leads to a worse performance than inlining nothing at all. Inline expansion itself is an optimization, since...

needed] Together with James Glimm and Arthur Jaffe he invented the cluster expansion approach to quantum field theory that is widely used in constructive field...

therefrom can approach the age of the universe. Consequently, they can be used to measure not only the present-day expansion rate but also the expansion history...

}^{\dagger }P_{\mathbf {k} }\rangle } is constructed using the cluster-expansion approach. The quantity F ω {\displaystyle {\mathcal {F}}_{\omega }} contains...

Semiconductor luminescence equations Semiconductor Bloch equations Cluster-expansion approach Semiconductor laser theory Quantum beats Spin echo Stark effect...

{\displaystyle (J+K)} -particle correlations as defined with the cluster-expansion approach. Using the same second-quantization formalism for the matter being...

systematically included by using various techniques such as the cluster-expansion approach. Both the SBEs and SLEs contain an identical homogeneous part...

low density of superclusters means that they, unlike clusters, expand with the Hubble expansion. The number of superclusters in the observable universe...

A galaxy cluster, or a cluster of galaxies, is a structure that consists of anywhere from hundreds to thousands of galaxies that are bound together by...

A multipole expansion is a mathematical series representing a function that depends on angles—usually the two angles used in the spherical coordinate...

be systematically truncated with different methods such as the cluster-expansion approach. At operator level, the microscopic polarization is defined by...

baryon acoustic oscillations, and in analyses of the clustering of galaxies. The accelerated expansion of the universe is thought to have begun since the...

coworkers used supersonic expansion of an atomic cluster source into a vacuum in the presence of an inert gas and produced atomic cluster beams. Heer's team...

reach the Solar System and Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable...

that ultimately galaxy clusters, stars, planets, atoms, nuclei, and matter itself will be torn apart by the ever-increasing expansion in a so-called Big Rip...

Automatic clustering algorithms are algorithms that can perform clustering without prior knowledge of data sets. In contrast with other cluster analysis...

immediate north and immediate south of the Manila cluster, respectively. The Metro Manila cluster would be formed by the existing NCR, plus nearby urban...

a marauder empire or an invasion by nanomachines from an extragalactic cluster. Later in the game, larger crisis events occur that have galaxy-wide implications—for...

matter was distributed homogeneously, but over billions of years, galaxies, clusters of galaxies, and superclusters coalesced. Einstein's theory of general...

§ Derivation of the Hubble parameter). We currently appear to be approaching a period where the expansion of the universe is exponential due to the increasing dominance...

Full configuration interaction (or full CI) is a linear variational approach which provides numerically exact solutions (within the infinitely flexible...

galaxies; the gravitational lensing of light by galaxy clusters; and the enhanced clustering of galaxies) that cannot be accounted for by the quantity...

Damara) (a dialect cluster including ǂAakhoe and Haiǁom) Eini (extinct) South Khoekhoe Korana (moribund) Xiri (moribund; a dialect cluster) Tshu–Khwe (or...

originated from a prehistoric seaborne migration, known as the Austronesian expansion, from Taiwan, circa 3000 to 1500 BCE. Austronesians reached the Batanes...

(1979). "A response-function approach to the direct calculation of the transition-energy in a multiple-cluster expansion formalism". Chemical Physics...

the expansion history of the universe by taking passively evolving early-type galaxies as "cosmic chronometers". From this point, this approach provides...