Asymptotic exactness of c-number substitution in Bogolyubov's theory of superfluidity

dc.contributor.author	Bogolyubov (jr), N.N.
dc.contributor.author	Sankovich, D.P.
dc.date.accessioned	2012-04-08T15:20:43Z
dc.date.available	2012-04-08T15:20:43Z
dc.date.issued	2010
dc.identifier.citation	Asymptotic exactness of c-number substitution in Bogolyubov's theory of superfluidity / N.N. Bogolyubov, Jr., D.P. Sankovich // Condensed Matter Physics. — 2010. — Т. 13, № 2. — С. 23002: 1-6. — Бібліогр.: 14 назв. — англ.	uk_UA
dc.identifier.issn	1607-324X
dc.identifier.other	PACS: 05.30.Jp, 03.75.Fi, 67.40.-w
dc.identifier.uri	http://dspace.nbuv.gov.ua/handle/123456789/32088
dc.description.abstract	The Bogolyubov model of liquid helium is considered. The validity of substituting a c-number for the k=0 mode operator â0 is established rigorously. The domain of stability of the Bogolyubov's Hamiltonian is found. We derive sufficient conditions which ensure the appearance of the Bose condensate in the model. For some temperatures and some positive values of the chemical potential, there is a gapless Bogolyubov spectrum of elementary excitations, leading to a proper microscopic interpretation of superfluidity.	uk_UA
dc.language.iso	en	uk_UA
dc.publisher	Інститут фізики конденсованих систем НАН України	uk_UA
dc.relation.ispartof	Condensed Matter Physics
dc.title	Asymptotic exactness of c-number substitution in Bogolyubov's theory of superfluidity	uk_UA
dc.type	Article	uk_UA
dc.status	published earlier	uk_UA