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pro vyhledávání: '"Andreev, Pavel"'
Autor:
Andreev, Pavel A.
Ultracold Bose atoms is the physical system, where the quantum and nonlinear phenomena play crucial role. Ultracold bosons are considered at the small finite temperatures. Bosons are considered as two different fluids: Bose-Einstein condensate and no
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4830e752df87d2bb2911f7d625cbe2ad
Autor:
Andreev, Pavel A.
A minimal coupling quantum hydrodynamic model of spin-1/2 fermions at the full spin polarization corresponding to a nonlinear Schrodinger equation is considered. The nonlinearity is primarily caused by the Fermi pressure. It provides an effective rep
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b06ef3d3fb5505c29b25d288df775f12
Autor:
Andreev, Pavel A.
Several hydrodynamic models the atomic Bose-Einstein condensate beyond the mean-field approximation are discussed together from one point of view. All these models are derived from microscopic quantum description. The derivation is made within the ma
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2724176c0be742f00de171dc97173cb8
http://arxiv.org/abs/2007.15045
http://arxiv.org/abs/2007.15045
Autor:
Andreev, Pavel A.
A possibility of the hydrodynamic description of ultracold fermions via the microscopic derivation of the model is described. Differently truncated hydrodynamic models are derived and compared. All models are based on the microscopic many-particle Sc
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c9498ec90c7a04e0ed93bb78f6287ce7
http://arxiv.org/abs/2001.02764
http://arxiv.org/abs/2001.02764
Repulsive Bose-Einstein condensate, where the short-range interaction is included up to the third order by the interaction radius, demonstrates existence of a bright soliton in a narrow interval of parameters. This soliton is studied here for the bos
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b44f8a3a5f3fb060103bcfef196d659f
Autor:
Andreev, Pavel A.
Usually, hydrodynamic equations are restricted by the continuity and Euler equations. However, the account of the higher moments of the distribution function gives better description of the kinetic properties. Therefore, the pressure tensor evolution
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d60d81bea3a2e17bd93a6c6089cb2505
http://arxiv.org/abs/1912.00843
http://arxiv.org/abs/1912.00843
Autor:
Andreev, Pavel A.
The quantum hydrodynamic model is developed for the axial symmetric anisotropic short-range interaction. The quantum stress tensor presents the interaction. It is derived up to the third order by the interaction radius. The first order by the interac
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9823e83e66061244320e09a508fb543
http://arxiv.org/abs/1809.00017
http://arxiv.org/abs/1809.00017
Autor:
Andreev, Pavel A., Kuz'menkov, L. S.
We discuss complete theory of point-like particles in fully polarized BECs describing difference in behaviour of electrically- and magnetically polarized BECs. Next we present generalization of this theory on finite size particles to include contribu
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b44a3a69ad7848ddfa52b9bda0f6b1c3
http://arxiv.org/abs/1401.4842
http://arxiv.org/abs/1401.4842
Autor:
Andreev, Pavel A.
Dipole-dipole interaction is a long-range interaction, hence we could expect that the self-consistent field approximation might be applied. In most cases it is correct, but dipolar BECs reveal a surprise. Structure of the self-consistent field term r
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d4434b42c6d5d6e6c3098dbf443b04a9
Autor:
Andreev, Pavel A.
The self-consistent field approach for the electric dipolar ultracold spin-1/2 fermions is discussed. Contribution of the exchange part of the electric dipole interaction is found. Hence we obtain a model of dipolar fermions beyond the self-consisten
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https://explore.openaire.eu/search/publication?articleId=doi_dedup___::75e46973c66f4e68080ffb259430bc56