BEC Dynamics with Fluctuations: Beyond HFB Approximation
Nonequilibrium dynamics of a Bose-Einstein condensate (BEC) dynamics with fluctuations was analyzed using nonequilibrium many-body approaches beyond the Hartree-Fock-Bogoliubov (HFB) approximation. Nonequilbrium dynamics of BEC was loaded in an optical lattice was described by the closed-time-path (...
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Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1054660X_v14_n2_p318_Rey http://hdl.handle.net/20.500.12110/paper_1054660X_v14_n2_p318_Rey |
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paper:paper_1054660X_v14_n2_p318_Rey2023-06-08T16:03:10Z BEC Dynamics with Fluctuations: Beyond HFB Approximation Calzetta, Esteban Adolfo Approximation theory Condensation Convergence of numerical methods Correlation methods Green's function Hamiltonians Kinetic energy Oscillations Perturbation techniques Superlattices Multiparticle scattering Optical lattices Quantum theory Nonequilibrium dynamics of a Bose-Einstein condensate (BEC) dynamics with fluctuations was analyzed using nonequilibrium many-body approaches beyond the Hartree-Fock-Bogoliubov (HFB) approximation. Nonequilbrium dynamics of BEC was loaded in an optical lattice was described by the closed-time-path (CTP) functional formalism for two-particle irreducible (2PI) Green's function. It was observed that second-order 2PI approximations were able to capture the damping effects due to the multiplarticle scattering in a systematic way. It was also observed that second-order 2PI approximation worked at intermediate times when correlations were not negligible and standard mean-field techniques. Fil:Calzetta, E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1054660X_v14_n2_p318_Rey http://hdl.handle.net/20.500.12110/paper_1054660X_v14_n2_p318_Rey |
institution |
Universidad de Buenos Aires |
institution_str |
I-28 |
repository_str |
R-134 |
collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
topic |
Approximation theory Condensation Convergence of numerical methods Correlation methods Green's function Hamiltonians Kinetic energy Oscillations Perturbation techniques Superlattices Multiparticle scattering Optical lattices Quantum theory |
spellingShingle |
Approximation theory Condensation Convergence of numerical methods Correlation methods Green's function Hamiltonians Kinetic energy Oscillations Perturbation techniques Superlattices Multiparticle scattering Optical lattices Quantum theory Calzetta, Esteban Adolfo BEC Dynamics with Fluctuations: Beyond HFB Approximation |
topic_facet |
Approximation theory Condensation Convergence of numerical methods Correlation methods Green's function Hamiltonians Kinetic energy Oscillations Perturbation techniques Superlattices Multiparticle scattering Optical lattices Quantum theory |
description |
Nonequilibrium dynamics of a Bose-Einstein condensate (BEC) dynamics with fluctuations was analyzed using nonequilibrium many-body approaches beyond the Hartree-Fock-Bogoliubov (HFB) approximation. Nonequilbrium dynamics of BEC was loaded in an optical lattice was described by the closed-time-path (CTP) functional formalism for two-particle irreducible (2PI) Green's function. It was observed that second-order 2PI approximations were able to capture the damping effects due to the multiplarticle scattering in a systematic way. It was also observed that second-order 2PI approximation worked at intermediate times when correlations were not negligible and standard mean-field techniques. |
author |
Calzetta, Esteban Adolfo |
author_facet |
Calzetta, Esteban Adolfo |
author_sort |
Calzetta, Esteban Adolfo |
title |
BEC Dynamics with Fluctuations: Beyond HFB Approximation |
title_short |
BEC Dynamics with Fluctuations: Beyond HFB Approximation |
title_full |
BEC Dynamics with Fluctuations: Beyond HFB Approximation |
title_fullStr |
BEC Dynamics with Fluctuations: Beyond HFB Approximation |
title_full_unstemmed |
BEC Dynamics with Fluctuations: Beyond HFB Approximation |
title_sort |
bec dynamics with fluctuations: beyond hfb approximation |
publishDate |
2004 |
url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1054660X_v14_n2_p318_Rey http://hdl.handle.net/20.500.12110/paper_1054660X_v14_n2_p318_Rey |
work_keys_str_mv |
AT calzettaestebanadolfo becdynamicswithfluctuationsbeyondhfbapproximation |
_version_ |
1768545610930061312 |