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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thermodynamic constraints on matter creation models

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Valentim, R. [1] ; Jesus, J. F. [2, 3]
Total Authors: 2
[1] Univ Fed Sao Paulo UNIFESP, Inst Ciencias Ambientais Quim & Farmaceut ICAQF, Dept Fis, Unidade Jose Alencar, Rua Sao Nicolau 210, BR-09913030 Diadema, SP - Brazil
[2] Univ Estadual Paulista UNESP, Campus Expt Itapeva, Rua Geraldo Alckmin 519, BR-18409010 Itapeva, SP - Brazil
[3] Univ Estadual Paulista UNESP, Fac Engn Guaratingueta, Dept Quim & Fis, Av Dr Ariberto Pereira Cunha 333, BR-12516410 Guaratingueta, SP - Brazil
Total Affiliations: 3
Document type: Journal article
Source: EUROPEAN PHYSICAL JOURNAL C; v. 80, n. 11 NOV 9 2020.
Web of Science Citations: 0

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</mml:mover>>= 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<mml:mo>d</mml:mover><mml:mo><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 (S<gamma> 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 (S gamma). This analysis allows to estimate intervals of parameters of CCDM models. (AU)

FAPESP's process: 17/05859-0 - The accelerating universe: nature and tests of dark energy and dark matter
Grantee:José Fernando de Jesus
Support type: Regular Research Grants
FAPESP's process: 16/09831-0 - Neutron Stars populations: bayesian statistics tools
Grantee:Rodolfo Valentim da Costa Lima
Support type: Regular Research Grants
FAPESP's process: 13/26258-4 - Superdense matter in the universe
Grantee:Manuel Máximo Bastos Malheiro de Oliveira
Support type: Research Projects - Thematic Grants