Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field

The effects of the initial temperature in the out of equilibrium quantum field dynamics in the presence of a homogeneous external field are investigated. We consider an initial thermal state of temperature T for a constant external field J ->. A subsequent sign flip of the external field, J ->...

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Detalles Bibliográficos
Autores: Cao García, Francisco Javier, Feito, M.
Tipo de recurso: artículo
Fecha de publicación:2006
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/104682
Acceso en línea:https://hdl.handle.net/20.500.14352/104682
Access Level:acceso abierto
Palabra clave:536
Termodinámica
2213 Termodinámica
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spelling Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external fieldCao García, Francisco JavierFeito, M.536Termodinámica2213 TermodinámicaThe effects of the initial temperature in the out of equilibrium quantum field dynamics in the presence of a homogeneous external field are investigated. We consider an initial thermal state of temperature T for a constant external field J ->. A subsequent sign flip of the external field, J ->->-J ->, gives rise to an out of equilibrium nonperturbative quantum field dynamics. The dynamics is studied here for the symmetry broken lambda(Phi ->(2))(2) scalar N component field theory in the large N limit. We find a dynamical effective potential for the expectation value that helps us to understand the dynamics. The dynamics presents two regimes defined by the presence or absence of a temporal trapping close to the metastable equilibrium position of the potential. The two regimes are separated by a critical value of the external field that depends on the initial temperature. The temporal trapping is shorter for larger initial temperatures or larger external fields. Parametric resonances and spinodal instabilities amplify the quantum fluctuations in the field components transverse to the external field. When there is a temporal trapping, this is the main mechanism that allows the system to escape from the metastable state for large N. Subsequently, backreaction stops the growth of the quantum fluctuations and the system enters a quasiperiodic regime.American Physical SocietyUniversidad Complutense de Madrid20062006-01-0120062006-01-01journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/104682reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/1046822026-06-02T12:44:21Z
dc.title.none.fl_str_mv Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
title Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
spellingShingle Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
Cao García, Francisco Javier
536
Termodinámica
2213 Termodinámica
title_short Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
title_full Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
title_fullStr Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
title_full_unstemmed Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
title_sort Out of equilibrium quantum field dynamics of an initial thermal state after a change in the external field
dc.creator.none.fl_str_mv Cao García, Francisco Javier
Feito, M.
author Cao García, Francisco Javier
author_facet Cao García, Francisco Javier
Feito, M.
author_role author
author2 Feito, M.
author2_role author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 536
Termodinámica
2213 Termodinámica
topic 536
Termodinámica
2213 Termodinámica
description The effects of the initial temperature in the out of equilibrium quantum field dynamics in the presence of a homogeneous external field are investigated. We consider an initial thermal state of temperature T for a constant external field J ->. A subsequent sign flip of the external field, J ->->-J ->, gives rise to an out of equilibrium nonperturbative quantum field dynamics. The dynamics is studied here for the symmetry broken lambda(Phi ->(2))(2) scalar N component field theory in the large N limit. We find a dynamical effective potential for the expectation value that helps us to understand the dynamics. The dynamics presents two regimes defined by the presence or absence of a temporal trapping close to the metastable equilibrium position of the potential. The two regimes are separated by a critical value of the external field that depends on the initial temperature. The temporal trapping is shorter for larger initial temperatures or larger external fields. Parametric resonances and spinodal instabilities amplify the quantum fluctuations in the field components transverse to the external field. When there is a temporal trapping, this is the main mechanism that allows the system to escape from the metastable state for large N. Subsequently, backreaction stops the growth of the quantum fluctuations and the system enters a quasiperiodic regime.
publishDate 2006
dc.date.none.fl_str_mv 2006
2006-01-01
2006
2006-01-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/104682
url https://hdl.handle.net/20.500.14352/104682
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv American Physical Society
publisher.none.fl_str_mv American Physical Society
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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