ISSN:
0392-6737
Keywords:
General theories and computational techniques (including many-body perturbation theory, density-functional theory, atomic sphere approximation methods, Fourier decompositon methods, etc.)
;
Developments in mathematical and computational techniques
;
Numerical approximation and analysis
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Summary The recently introduced Connected-Moments Expansion (CMX) is compared to a variational Lanczos scheme for estimating ground-state energies of many-body systems. A systematic approach is given for three quantum-mechanical systems: harmonic oscillator, anharmonic oscillator and the Kondo model. A second-order analysis is given in terms of particular ratios of moments of the Hamiltonian.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF02463732
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