Growing classical and quantum entropies in the early universe

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Following the idea that the global and local arrow of time has a cosmological origin, we define an entropy in the classical and in the quantum periods of the universe evolution. For the quantum period a semi-classical approach is adopted, modelling the universe with Wheeler-De Witt equation and usin...

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Autores principales: Ardenghi, J.S., Castagnino, M.A.
Formato: JOUR
Materias:
Decoherence
Entropy
Quantum universe
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00207748_v49_n1_p171_Ardenghi
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00207748_v49_n1_p171_Ardenghi
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spelling todo:paper_00207748_v49_n1_p171_Ardenghi2023-10-03T14:20:28Z Growing classical and quantum entropies in the early universe Ardenghi, J.S. Castagnino, M.A. Decoherence Entropy Quantum universe Following the idea that the global and local arrow of time has a cosmological origin, we define an entropy in the classical and in the quantum periods of the universe evolution. For the quantum period a semi-classical approach is adopted, modelling the universe with Wheeler-De Witt equation and using WKB. By applying the self-induced decoherence to the state of the universe it is proved that the quantum universe becomes a classical one. This allows us to define a conditional entropy which, in our simplified model, is proportional to e2γt where γ is the dumping factor associated with the interaction potential of the scalar fields. Finally we find both Gibbs and thermodynamical entropy of the universe based in the conditional entropy. © Springer Science+Business Media, LLC 2009. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00207748_v49_n1_p171_Ardenghi
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Decoherence
Entropy
Quantum universe
spellingShingle Decoherence
Entropy
Quantum universe
Ardenghi, J.S.
Castagnino, M.A.
Growing classical and quantum entropies in the early universe
topic_facet Decoherence
Entropy
Quantum universe
description Following the idea that the global and local arrow of time has a cosmological origin, we define an entropy in the classical and in the quantum periods of the universe evolution. For the quantum period a semi-classical approach is adopted, modelling the universe with Wheeler-De Witt equation and using WKB. By applying the self-induced decoherence to the state of the universe it is proved that the quantum universe becomes a classical one. This allows us to define a conditional entropy which, in our simplified model, is proportional to e2γt where γ is the dumping factor associated with the interaction potential of the scalar fields. Finally we find both Gibbs and thermodynamical entropy of the universe based in the conditional entropy. © Springer Science+Business Media, LLC 2009.
format JOUR
author Ardenghi, J.S.
Castagnino, M.A.
author_facet Ardenghi, J.S.
Castagnino, M.A.
author_sort Ardenghi, J.S.
title Growing classical and quantum entropies in the early universe
title_short Growing classical and quantum entropies in the early universe
title_full Growing classical and quantum entropies in the early universe
title_fullStr Growing classical and quantum entropies in the early universe
title_full_unstemmed Growing classical and quantum entropies in the early universe
title_sort growing classical and quantum entropies in the early universe
url http://hdl.handle.net/20.500.12110/paper_00207748_v49_n1_p171_Ardenghi
work_keys_str_mv AT ardenghijs growingclassicalandquantumentropiesintheearlyuniverse
AT castagninoma growingclassicalandquantumentropiesintheearlyuniverse
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