Thermodynamic constraints on matter creation models
Autor(a) principal: | |
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Data de Publicação: | 2020 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1140/epjc/s10052-020-08592-6 http://hdl.handle.net/11449/206802 |
Resumo: | Entropy is a fundamental concept from Thermodynamics and it can be used to study models on context of Creation Cold Dark Matter (CCDM). From conditions on the first (S˙ ≥ 0) (throughout the present work we will use dots to indicate time derivatives and dashes to indicate derivatives with respect to scale factor) and second order (S¨ < 0) time derivatives of total entropy in the initial expansion of Sitter through the radiation and matter eras until the end of Sitter expansion, it is possible to estimate the intervals of parameters. The total entropy (St) is calculated as sum of the entropy at all eras (Sγ and Sm) plus the entropy of the event horizon (Sh). This term derives from the Holographic Principle where it suggests that all information is contained on the observable horizon. The main feature of this method for these models are that thermodynamic equilibrium is reached in a final de Sitter era. Total entropy of the universe is calculated with three terms: apparent horizon (Sh), entropy of matter (Sm) and entropy of radiation (Sγ). This analysis allows to estimate intervals of parameters of CCDM models. |
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Thermodynamic constraints on matter creation modelsEntropy is a fundamental concept from Thermodynamics and it can be used to study models on context of Creation Cold Dark Matter (CCDM). From conditions on the first (S˙ ≥ 0) (throughout the present work we will use dots to indicate time derivatives and dashes to indicate derivatives with respect to scale factor) and second order (S¨ < 0) time derivatives of total entropy in the initial expansion of Sitter through the radiation and matter eras until the end of Sitter expansion, it is possible to estimate the intervals of parameters. The total entropy (St) is calculated as sum of the entropy at all eras (Sγ and Sm) plus the entropy of the event horizon (Sh). This term derives from the Holographic Principle where it suggests that all information is contained on the observable horizon. The main feature of this method for these models are that thermodynamic equilibrium is reached in a final de Sitter era. Total entropy of the universe is calculated with three terms: apparent horizon (Sh), entropy of matter (Sm) and entropy of radiation (Sγ). This analysis allows to estimate intervals of parameters of CCDM models.Departamento de Física Instituto de Ciências Ambientais Químicas e Farmacêuticas-ICAQF Universidade Federal de São Paulo (UNIFESP), Unidade José Alencar, Rua São Nicolau No. 210Universidade Estadual Paulista (UNESP) Câmpus Experimental de Itapeva, Rua Geraldo Alckmin 519, Vila N. Sra. de FátimaDepartamento de Física e Química Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha 333Universidade Estadual Paulista (UNESP) Câmpus Experimental de Itapeva, Rua Geraldo Alckmin 519, Vila N. Sra. de FátimaDepartamento de Física e Química Faculdade de Engenharia de Guaratinguetá Universidade Estadual Paulista (UNESP), Av. Dr. Ariberto Pereira da Cunha 333Universidade Federal de São Paulo (UNIFESP)Universidade Estadual Paulista (Unesp)Valentim, R.Jesus, J. F. [UNESP]2021-06-25T10:44:05Z2021-06-25T10:44:05Z2020-11-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://dx.doi.org/10.1140/epjc/s10052-020-08592-6European Physical Journal C, v. 80, n. 11, 2020.1434-60521434-6044http://hdl.handle.net/11449/20680210.1140/epjc/s10052-020-08592-62-s2.0-85095711431Scopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengEuropean Physical Journal Cinfo:eu-repo/semantics/openAccess2024-07-01T20:52:27Zoai:repositorio.unesp.br:11449/206802Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-07-01T20:52:27Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false |
dc.title.none.fl_str_mv |
Thermodynamic constraints on matter creation models |
title |
Thermodynamic constraints on matter creation models |
spellingShingle |
Thermodynamic constraints on matter creation models Valentim, R. |
title_short |
Thermodynamic constraints on matter creation models |
title_full |
Thermodynamic constraints on matter creation models |
title_fullStr |
Thermodynamic constraints on matter creation models |
title_full_unstemmed |
Thermodynamic constraints on matter creation models |
title_sort |
Thermodynamic constraints on matter creation models |
author |
Valentim, R. |
author_facet |
Valentim, R. Jesus, J. F. [UNESP] |
author_role |
author |
author2 |
Jesus, J. F. [UNESP] |
author2_role |
author |
dc.contributor.none.fl_str_mv |
Universidade Federal de São Paulo (UNIFESP) Universidade Estadual Paulista (Unesp) |
dc.contributor.author.fl_str_mv |
Valentim, R. Jesus, J. F. [UNESP] |
description |
Entropy is a fundamental concept from Thermodynamics and it can be used to study models on context of Creation Cold Dark Matter (CCDM). From conditions on the first (S˙ ≥ 0) (throughout the present work we will use dots to indicate time derivatives and dashes to indicate derivatives with respect to scale factor) and second order (S¨ < 0) time derivatives of total entropy in the initial expansion of Sitter through the radiation and matter eras until the end of Sitter expansion, it is possible to estimate the intervals of parameters. The total entropy (St) is calculated as sum of the entropy at all eras (Sγ and Sm) plus the entropy of the event horizon (Sh). This term derives from the Holographic Principle where it suggests that all information is contained on the observable horizon. The main feature of this method for these models are that thermodynamic equilibrium is reached in a final de Sitter era. Total entropy of the universe is calculated with three terms: apparent horizon (Sh), entropy of matter (Sm) and entropy of radiation (Sγ). This analysis allows to estimate intervals of parameters of CCDM models. |
publishDate |
2020 |
dc.date.none.fl_str_mv |
2020-11-01 2021-06-25T10:44:05Z 2021-06-25T10:44:05Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://dx.doi.org/10.1140/epjc/s10052-020-08592-6 European Physical Journal C, v. 80, n. 11, 2020. 1434-6052 1434-6044 http://hdl.handle.net/11449/206802 10.1140/epjc/s10052-020-08592-6 2-s2.0-85095711431 |
url |
http://dx.doi.org/10.1140/epjc/s10052-020-08592-6 http://hdl.handle.net/11449/206802 |
identifier_str_mv |
European Physical Journal C, v. 80, n. 11, 2020. 1434-6052 1434-6044 10.1140/epjc/s10052-020-08592-6 2-s2.0-85095711431 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
European Physical Journal C |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
Scopus reponame:Repositório Institucional da UNESP instname:Universidade Estadual Paulista (UNESP) instacron:UNESP |
instname_str |
Universidade Estadual Paulista (UNESP) |
instacron_str |
UNESP |
institution |
UNESP |
reponame_str |
Repositório Institucional da UNESP |
collection |
Repositório Institucional da UNESP |
repository.name.fl_str_mv |
Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP) |
repository.mail.fl_str_mv |
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1803649995835965440 |