Zobrazeno 1 - 10
of 43
pro vyhledávání: '"D.P. Sankovich"'
Autor:
N.N. Bogolyubov, Jr., D.P. Sankovich
Publikováno v:
Condensed Matter Physics, Vol 13, Iss 2, p 23002 (2010)
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 wh
Externí odkaz:
https://doaj.org/article/3014755fb3f246b3b6dfeb8abee1ac36
Autor:
M. Corgini, D.P. Sankovich
Publikováno v:
Condensed Matter Physics, Vol 13, Iss 4, p 43003 (2010)
For a Bose atom system whose energy operator is diagonal in the so-called number operators and its ground state has an internal two-level structure with negative energies, exact expressions for the limit free canonical energy and pressure are obtaine
Externí odkaz:
https://doaj.org/article/81d0506231fd423db6960f2342c7fc5d
Autor:
D.P. Sankovich
Publikováno v:
Physica B: Condensed Matter. 493:43-46
The upper bound on the isothermal compressibility for lattice bosons in the uniform Bose–Hubbard model is derived.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4353431c77a717c620dd9323fd8ac6ab
https://doi.org/10.1016/j.physb.2016.04.018
https://doi.org/10.1016/j.physb.2016.04.018
Autor:
D.P. Sankovich
Publikováno v:
Physics Letters A. 377:2905-2908
We use infrared bounds method to study the existence of a Bose condensation phase transition in a three-dimensional lattice model of interacting bosons. Upper bound (local Gaussian domination) is presented on the Bogolyubov inner product of creation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8f778fd600e0d329c7c72bfbce77804c
https://doi.org/10.1016/j.physleta.2013.08.045
https://doi.org/10.1016/j.physleta.2013.08.045
Autor:
D.P. Sankovich, M. Corgini
Publikováno v:
Modern Physics Letters B. 13:411-415
A quantum system of nonlinear oscillators is considered. Within the framework of Berezin's functional integral we prove the gaussian domination at finite temperature for some values of the chemical potential. Upper and lower bounds for the average nu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::410963d77b91e40ef738a9430f7ebb97
https://doi.org/10.1142/s0217984999000518
https://doi.org/10.1142/s0217984999000518
Publikováno v:
Modern Physics Letters B. :215-220
For the υ-dimensional lattice boson gas with the onsite repulsion and nearest neighbour sites attraction, we prove the existence of phase transition for ν≥3 and sufficiently large density when temperature is sufficiently small. This phase transit
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5316c1d7e5324872a8a69dc2d6f2018
https://doi.org/10.1142/s0217984992000284
https://doi.org/10.1142/s0217984992000284
Autor:
Nikolai N. Bogolubov, D.P. Sankovich
Publikováno v:
Modern Physics Letters B. :51-56
A quantum system of coupled anharmonic oscillators on v-dimensional hypercubic lattice is considered. The upper bound on the pair correlator is obtained. For the representation of creation-annihilation operators this system corresponds to a lattice b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8a0d0eeac8d80ae922286d537e13376a
https://doi.org/10.1142/s0217984991000071
https://doi.org/10.1142/s0217984991000071
Autor:
D.P. Sankovich, M. Corgini
We study, using the Bogolyubov approximation, the thermodynamic behavior of a superstable Bose system whose energy operator in the second-quantized form contains a nonlinear expression in the occupation numbers operators. We prove that for all values
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cfb35a7e6897d73bfc7e5dcfa3f4a8c
Autor:
D.P. Sankovich
Publikováno v:
Modern Physics Letters B. :221-224
A generating thermodynamic functional for the one-dimensional, one-component hydrodynamic type system with the Hamiltonian density au2+bu4is determined. Correlation functions of this model are considered.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dff60a20a9afe88efbbe40e7357bd305
https://doi.org/10.1142/s0217984987000302
https://doi.org/10.1142/s0217984987000302
Autor:
D.P. Sankovich
Publikováno v:
Modern Physics Letters B. :471-478
A model of the non-ideal Bose gas is considered. We prove the existence of condensate in the model at sufficiently low temperature. The method of majorizing estimates for the Duhamel Two Point Functions is used. The equation for the critical temperat
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::161d7ca9d80618a861b35ca8fcfa3402
https://doi.org/10.1142/s0217984989000741
https://doi.org/10.1142/s0217984989000741