Quintessence behavior via matter creation cosmology

• Main Authors: C. P. Singh, Ajay Kumar
• Format: Article
• Language: English
• Published: SpringerOpen 2020-02-01
• Series: European Physical Journal C: Particles and Fields
• Online Access: https://doi.org/10.1140/epjc/s10052-020-7679-2

Abstract We study the matter creation cosmology as an alternative theory to explain the dark energy phenomena. We discuss the matter-dominated Universe in a flat Friedmann-Robertson-Walker line element by adopting the thermodynamics of open systems, in which the matter creation irreversible processes may take place at a cosmological scale. We propose a new form of the matter creation rate, $$\varGamma =3\alpha H_0+3\beta H+3\gamma \; \frac{\ddot{a}}{{\dot{a}}}$$ Γ=3αH0+3βH+3γa¨a˙ , which generalizes some of the previous models in the literature. Exact solutions of the field equations are found and discussed the evolution of the Universe. Constraints on the model parameters are obtained from Markov Chain Monte Carlo (MCMC) analysis using the Supernova distance modulus data, observational measurements of Hubble parameter, Baryon acoustic oscillation data. The trajectories of the evolution of the scale factor, deceleration parameter and equation of state parameter are plotted by using best-fit values of the parameters. It is observed that the model shows accelerating behavior and behaves quintessence like ($$\omega >-1$$ ω>-1 ). The age of the Universe is obtained which is in good agreement with $$\varLambda $$ Λ CDM model. We examine the model using two independent diagnostic parameters, namely statefinder and $$\textit{Om}$$ Om . We apply Akaike information criterion (AIC) and Bayesian information criterion (BIC) to discriminate the model based on the penalization associated to the number of parameters. The analysis shows that the model has close resemblance to the $$\varLambda CDM$$ ΛCDM cosmology. We also discuss the thermodynamics of the model and find that the model satisfies the generalized second law of thermodynamics with certain constraints.