Entropy and creation cold dark matter models

Author(s)

Valentim, R. ^{[1, 2]} ; Jesus, J. F. ^{[1, 3]}

Affiliation

^[1] Fed Univ Sao Paulo UNIFESP, Dept Phys, Sao Paulo - Brazil

^[2] Rua Geraldo Alckmin 519, BR-18409010 Itapeva, SP - Brazil

^[3] Univ Estadual Paulista UNESP, Dept Wood Engn, Sao Paulo - Brazil

• Document type: Journal article
• Source: ASTRONOMISCHE NACHRICHTEN; v. 340, n. 1-3, SI, p. 105-107, JAN-MAR 2019.
• Web of Science Citations: 0

Abstract

Entropy is a fundamental concept from thermodynamics, and it can be used to study models in the context of the creation cold dark matter. A general feature of these models is that thermodynamic equilibrium is reached at last at the de Sitter era. Total Universe's entropy is calculated based on three terms: apparent horizon (S-h), entropy of matter (S-m), and entropy of radiation (S). The constraints from total entropy come from the first and second derivatives () to estimate the parameters of the model with the general matter creation rate. The preliminary outcomes suggest limits for these parameters. (AU)

• 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: 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