Irreversible dynamics of quasispin systems

It is shown that nuclear matter described by quasispin or pseudospin operators may exhibit irreversible behavior, in the sense of modern kinetic theory. With the help of the group-contraction technique, a harmonic oscillator can be associated to the many-body system and it is seen that in the standa...

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Autores principales: Hernandez, E.S., Solari, H.G.
Formato: JOUR
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_05562813_v25_n4_p2087_Hernandez
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_05562813_v25_n4_p2087_Hernandez2023-10-03T15:34:30Z Irreversible dynamics of quasispin systems Hernandez, E.S. Solari, H.G. It is shown that nuclear matter described by quasispin or pseudospin operators may exhibit irreversible behavior, in the sense of modern kinetic theory. With the help of the group-contraction technique, a harmonic oscillator can be associated to the many-body system and it is seen that in the standard Lipkin-Meshkov-Glick model the ground-state phase transition gives rise to a significant change in the spectral properties of the characteristic operators. This fact makes room for the introduction of the microscopic operators of irreversible dynamics. Their meaning and the consequences of their existence are examined and it is seen that the time evolution of the quasispin arrangement closely resembles the approach to equilibrium of a macroscopic system. NUCLEAR STRUCTURE Operators of irreversible Hamiltonian dynamics; quasispin nuclear matter; group contraction, Lipkin-Meshkov-Glick model; ground-state phase transition; entropy; irreversible approach to equilibrium. © 1982 The American Physical Society. Fil:Hernandez, E.S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Solari, H.G. 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_05562813_v25_n4_p2087_Hernandez
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description It is shown that nuclear matter described by quasispin or pseudospin operators may exhibit irreversible behavior, in the sense of modern kinetic theory. With the help of the group-contraction technique, a harmonic oscillator can be associated to the many-body system and it is seen that in the standard Lipkin-Meshkov-Glick model the ground-state phase transition gives rise to a significant change in the spectral properties of the characteristic operators. This fact makes room for the introduction of the microscopic operators of irreversible dynamics. Their meaning and the consequences of their existence are examined and it is seen that the time evolution of the quasispin arrangement closely resembles the approach to equilibrium of a macroscopic system. NUCLEAR STRUCTURE Operators of irreversible Hamiltonian dynamics; quasispin nuclear matter; group contraction, Lipkin-Meshkov-Glick model; ground-state phase transition; entropy; irreversible approach to equilibrium. © 1982 The American Physical Society.
format JOUR
author Hernandez, E.S.
Solari, H.G.
spellingShingle Hernandez, E.S.
Solari, H.G.
Irreversible dynamics of quasispin systems
author_facet Hernandez, E.S.
Solari, H.G.
author_sort Hernandez, E.S.
title Irreversible dynamics of quasispin systems
title_short Irreversible dynamics of quasispin systems
title_full Irreversible dynamics of quasispin systems
title_fullStr Irreversible dynamics of quasispin systems
title_full_unstemmed Irreversible dynamics of quasispin systems
title_sort irreversible dynamics of quasispin systems
url http://hdl.handle.net/20.500.12110/paper_05562813_v25_n4_p2087_Hernandez
work_keys_str_mv AT hernandezes irreversibledynamicsofquasispinsystems
AT solarihg irreversibledynamicsofquasispinsystems
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