On the Cosmological Models with Matter Creation

Abstract

The matter creation model of Prigogine--Géhéniau--Gunzig--Nardone is revisited in terms of a redefined creation pressure which does not lead to irreversible adiabatic evolution at constant specific entropy. With the resulting freedom to choose a particular gas process, a flat FRWL cosmological model is proposed based on three input characteristics: (i) a perfect fluid comprising of an ideal gas, (ii) a quasi-adiabatic polytropic process, and (iii) a particular rate of particle creation. Such model leads to the description of the late-time acceleration of the expanding Universe with a natural transition from decelerating to accelerating regime. Only the Friedmann equations and the laws of thermodynamics are used and no assumptions of dark energy component is made. The model also allows the explicit determination as functions of time of all variables, including the entropy, the non-conserved specific entropy and the time the accelerating phase begins. A form of correspondence with the dark energy models (quintessence, in particular) is established via the $Om$ diagnostics. Parallels with the concordance cosmological $\Lambda$CDM model for the matter-dominated epoch and the present epoch of accelerated expansion are also established via slight modifications of both models.

19 pages, 1 figure, to appear in European Physical Journal C

References in corpus (6)

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Cited by in corpus (6)

• Gravitationally induced particle production in scalar-tensor $f(R,T)$ gravity
• Irreversible thermodynamical description of warm inflationary cosmological models
• Observational constraints on the interacting dark energy - dark matter (IDM) cosmological models
• Matter Creation Cosmologies and Accelerated Expansion
• Particle Production Scenario in an Algebraically Coupled Quintessence Field with a Dark Matter Fluid
• Entropies of the various components of the universe