Quintessence behavior via matter creation cosmology

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, Γ = 3α H 0 + 3β H + 3γäȧ , 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 (ω > −1). The age of the Universe is obtained which is in good agreement with ΛCDM model. We examine the model using two independent diagnostic parameters, namely statefinder and Om. We apply Akaike information criterion (AI C) and Bayesian information criterion (B I C) 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 ΛC DM cosmology. We also discuss the thermodynamics of the model and find that the model satisfies the generalized second law of thermodynamics with certain constraints.

Statefinder diagnosis of Tsallis holographic dark energy model in f(R, T) Theory

“…Here, while the Universe is passing from deceleration to acceleration for t = 0, q > 0 so the constrain for the parameters is obtained as b a < 1 2 . Also, t 0 showing the age of the Universe, in this study is considered as t 0 = 13.8Gyr relying on SN Ia+OHD (SN:Supernovae, OHD:Observational Hubble Data) [34]. On the other hand, for the deceleration parameter there is the value of q 0 = q(t 0 ) = − 0.73 according to SN Ia observational data [35].…”

Gravitational induced particle production in scalar-tensor $f(R,T)$ gravity

“…A covariant formulation of the irreversible thermodynamics was developed in [73]. In fact, irreversible thermodynamics and thermodynamics of open systems is a widely studied field, since it is useful in various applications [74][75][76][77][78][79][80][81][82][83][84].…”

Entropy production due to adiabatic particle creation in a holographic dissipative cosmology

“…The second type is BV [34,47], which is similar to both bulk viscous models [10][11][12][13][14] and CCDM models [15][16][17][18][19][20][21][22][23][24][25][26]. In BV (bulk-viscous-cosmology-like) models, the acceleration equation includes an extra driving term, whereas the Friedmann equation does not [34,47].…”

“…An accelerated expansion of the late universe [1,2] has been widely accepted as a new paradigm. To explain the accelerated expansion, astrophysicists have proposed several cosmological models [3]: e.g., ΛCDM (Lambda cold dark matter) models, Λ(t)CDM models (i.e., a timevarying Λ(t) cosmology) [4][5][6][7][8][9], bulk viscous models [10][11][12][13][14], and the creation of CDM (CCDM) models [15][16][17][18][19][20][21][22][23][24][25][26], as well as other scenarios . The evolution of the universe has been recently examined from a thermodynamic viewpoint, using such models [41][42][43][44][45][46][47][48][49][50][51][52][53][54][55][56][57][58][59].…”