Entropy and creation cold dark matter models. Issue 1 (28th March 2019)

• Record Type: Journal Article
• Authors: Valentim, R.; Jesus, J. F.
• Other Names: Zen Vasconcellos C. A. guestEditor.; Solano J. guestEditor.; Horvath J. guestEditor.; Machado M. guestEditor.; Gamarra M. guestEditor.; Razeira M. guestEditor.; Hess P. guestEditor.; González Felipe R. guestEditor.; Boller Th. guestEditor.
• Is Part Of: Astronomische Nachrichten. Volume 340:Issue 1/3(2019)
• Page Start: 105
• Page End: 107
• Publication Date: 2019-03-28
• Subjects: creation of matter -- dark matter -- entropy -- models; Astronomy -- Periodicals; 520.5
• DOI: 10.1002/asna.201913570
• Languages: English
• ISSNs: 0004-6337

Abstract

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 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.