Regular Article - Theoretical Physics
On the cosmological models with matter creation
School of Mathematical Sciences, Technological University Dublin, City Campus, Kevin Street, Dublin, D08 NF82, Ireland
* e-mail: firstname.lastname@example.org
Accepted: 8 November 2019
Published online: 27 November 2019
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 CDM model for the matter-dominated epoch and the present epoch of accelerated expansion are also established via slight modifications of both models.
© The Author(s), 2019