Do current observations support transient acceleration of our universe?

Abstract

In the present article we have investigated a very natural question regarding the dynamics of the universe, namely, the possibility of its decelerating phase immediately after the present accelerating phase. To begin with, we have focused on the matter creation theory which is considered to be a viable alternative to dark energy and modified gravity models. Moreover, we have introduced the cosmographic approach which allows us to express the free parameters of a cosmological model in terms of the known cosmographic parameters. Assuming a generalized matter creation rate we have discussed the theoretical bounds on the model parameters allowing the future deceleration of the universe. Moreover, using the observational bounds on the cosmographic parameters obtained from the low redshifts observational probes, we have also examined the chance of a decelerating phase of the universe. Finally, considering a variety of known cosmological models and parametrizations, we have tested the same possibility. Our analysis shows that the chance of a future decelerating expansion of the universe is highly dependent on the choice of the cosmological models and parametrizations and also on the observational data. Even though the future decelerating expansion is allowed in some cosmological frameworks, but we do not see any strong evidence in favor of this. Perhaps, the future cosmological surveys could offer some more information regarding the fate of the universe.

18 pages, 1 Table and 5 Figures; typos corrected; version published in IJMPD

References in corpus (27)

• Dynamics of dark energy
• In the Realm of the Hubble tension $-$ a Review of Solutions
• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Reconstructing Dark Energy
• Reconstruction of the deceleration parameter and the equation of state of dark energy
• The Hubble series: Convergence properties and redshift variables
• Three thermodynamically-based parametrizations of the deceleration parameter
• An Accelerating Cosmology Without Dark Energy
• Scalar-field-dominated cosmology with a transient accelerating phase
• Matter creation and cosmic acceleration
• Dynamical dark energy after Planck CMB final release and $H_0$ tension
• Cosmic Jerk, Snap and Beyond
• $Om$ diagnostic applied to scalar field models and slowing down of cosmic acceleration
• Is Emergent Universe a Consequence of Particle Creation Process?
• The Statefinder hierarchy: An extended null diagnostic for concordance cosmology
• Constraining a dark matter and dark energy interaction scenario with a dynamical equation of state
• Observational Constraints on New Exact Inflationary Scalar-field Solutions
• Cosmic acceleration without dark energy: Background tests and thermodynamic analysis
• Brane assisted quintessential inflation with transient acceleration
• Simple inflationary quintessential model II: Power law potentials
• Cosmology, Thermodynamics and Matter Creation
• Analytic Solution of the Starobinsky Model for Inflation
• Early and Late Transient Cosmic Acceleration due to Curvature Inspired Dark Energy
• Will there be future deceleration? A study of particle creation mechanism in non-equilibrium thermodynamics
• The Peebles -- Vilenkin quintessential inflation model revisited
• Perfect Fluid Cosmological Universes: One equation of state and the most general solution
• Late transient acceleration of the universe in string theory on $S^1/Z_2$

Cited by in corpus (2)

• An exponential equation of state of dark energy in the light of 2018 CMB Planck data
• Revisiting the Matter Creation Process: Observational Constraints on Gravitationally Induced Dark Energy and the Hubble Tension