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Titolo:
SUPERFLUIDITY-III
Autore:
ANGELESCU N; VERBEURE A; ZAGREBNOV V;
Indirizzi:
KATHOLIEKE UNIV LEUVEN,INST THEORET FYS,CELESTIJNENLAAN 200 D B-3001 LOUVAIN BELGIUM UNIV AIX MARSEILLE 2,DEPT PHYS F-13288 MARSEILLE 9 FRANCE CPT LUMINY F-13288 MARSEILLE 9 FRANCE INST ATOM PHYS,DEPT THEORET PHYS R-76900 BUCHAREST ROMANIA
Titolo Testata:
Journal of physics. A, mathematical and general
fascicolo: 14, volume: 30, anno: 1997,
pagine: 4895 - 4913
SICI:
0305-4470(1997)30:14<4895:S>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
LARGE DEVIATION PRINCIPLE; INTERACTING BOSON GAS; MODEL; CONDENSATION; LIQUID-HE-4; FIELD; LIMIT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
N. Angelescu et al., "SUPERFLUIDITY-III", Journal of physics. A, mathematical and general, 30(14), 1997, pp. 4895-4913

Abstract

The theory of Bogoliubov contains the prescription of replacing the ground-state mode a(0)/root V by a constant b. In a previous contribution, we showed that the Bogoliubov model was thermodynamically unstable. We stabilized this model by adding 'forward scattering' terms. In this paper we exploit the fact that it is not compulsary to take b equalto c = (a(0))/root V. We show that if b = c the Bogoliubov theory does not have a satisfactory thermodynamics. We prove that it is possibleto make a proper choice of the ground-slate mode. i.e. b as a function of c, in order to obtain the correct excitation spectrum and thermodynamically a second-order phase transition, as is compulsory for a theory of superfluidity.

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Documento generato il 04/12/20 alle ore 19:04:45