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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Autores principales: Rey, A.M., Hu, B.L., Calzetta, E., Roura, A., Clark, C.
Formato: JOUR
Materias:
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
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_1054660X_v14_n2_p318_Rey
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_1054660X_v14_n2_p318_Rey
record_format dspace
spelling todo:paper_1054660X_v14_n2_p318_Rey2023-10-03T16:00:45Z BEC Dynamics with Fluctuations: Beyond HFB Approximation Rey, A.M. Hu, B.L. Calzetta, E. Roura, A. Clark, C. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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
Rey, A.M.
Hu, B.L.
Calzetta, E.
Roura, A.
Clark, C.
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.
format JOUR
author Rey, A.M.
Hu, B.L.
Calzetta, E.
Roura, A.
Clark, C.
author_facet Rey, A.M.
Hu, B.L.
Calzetta, E.
Roura, A.
Clark, C.
author_sort Rey, A.M.
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
url http://hdl.handle.net/20.500.12110/paper_1054660X_v14_n2_p318_Rey
work_keys_str_mv AT reyam becdynamicswithfluctuationsbeyondhfbapproximation
AT hubl becdynamicswithfluctuationsbeyondhfbapproximation
AT calzettae becdynamicswithfluctuationsbeyondhfbapproximation
AT rouraa becdynamicswithfluctuationsbeyondhfbapproximation
AT clarkc becdynamicswithfluctuationsbeyondhfbapproximation
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