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Titolo:
Issues and observations on applications of the constrained-path Monte Carlo method to many-fermion systems
Autore:
Carlson, J; Gubernatis, JE; Ortiz, G; Zhang, SW;
Indirizzi:
Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA UnivCalif Los Alamos Natl Lab Los Alamos NM USA 87545 amos, NM 87545 USA Coll William & Mary, Dept Phys, Williamsburg, VA 23187 USA Coll William & Mary Williamsburg VA USA 23187 Williamsburg, VA 23187 USA Coll William & Mary, Dept Appl Sci, Williamsburg, VA 23187 USA Coll William & Mary Williamsburg VA USA 23187 Williamsburg, VA 23187 USA
Titolo Testata:
PHYSICAL REVIEW B-CONDENSED MATTER
fascicolo: 20, volume: 59, anno: 1999,
pagine: 12788 - 12798
SICI:
0163-1829(19990515)59:20<12788:IAOOAO>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
2-DIMENSIONAL HUBBARD-MODEL; PAIRING CORRELATIONS; LATTICE FERMIONS; FIELD; SIMULATION; ENERGY;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
--discip_EC--
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Carlson, J Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA Univ Calif Los Alamos Natl Lab Los Alamos NM USA 87545 545 USA
Citazione:
J. Carlson et al., "Issues and observations on applications of the constrained-path Monte Carlo method to many-fermion systems", PHYS REV B, 59(20), 1999, pp. 12788-12798

Abstract

We report several important observations that underscore the distinctions between the constrained-path Monte Carlo method and the continuum and lattice versions of the fixed-node method. The main distinctions stern from the differences in the state space in which the random walk occurs and in the manner in which the random walkers are constrained. One consequence is that in the constrained-path method the so-called mixed estimator for the energyis not an upper bound to the exact energy, as previously claimed. Several ways of producing an energy upper bound are given, and relevant methodological aspects are illustrated with simple examples. [S0163-1829(99)06319-5].

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Documento generato il 10/07/20 alle ore 09:45:15