Valentim, R.Jesus, J. F. [UNESP]2019-10-062019-10-062019-01-01Astronomische Nachrichten, v. 340, n. 1-3, p. 105-107, 2019.1521-39940004-6337http://hdl.handle.net/11449/187495Entropy 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 γ ). The constraints from total entropy come from the first and second derivatives (S ′ ≥ 0 and S ″ < 0) to estimate the parameters of the model with the general matter creation rate. The preliminary outcomes suggest limits for these parameters.105-107engcreation of matterdark matterentropymodelsArtigo10.1002/asna.201913570Acesso restrito2-s2.0-85063502391