An exponential equation of state of dark energy in the light of 2018 CMB Planck data

The dynamics of the Universe is analyzed using an exponential function for the dark energy equation of state, known as Gong-Zhang parameterization. The phase space of the free parameters presented in the model is constrained using Cosmic Microwave Background radiation, Cosmic Chronometers, modulus distance from Hydrogen II Galaxies, Type Ia Supernovae and measurements from Baryon Acoustic Oscillations, together with a stronger bound from a Joint analysis. The cosmological model is confronted with ?CDM, observing there is a strong evidence for ?CDM in the Joint analysis although the exponential model is preferred when the data are separated. Based on the Joint analysis, a value of omega 0 = -1.202+0.027 -0.026 is found for the characteristic parameter presented in the equation of state. Additionally, the cosmographic parameters at current times are reported, having q0 = -0.789+0.034 -0.036, j0 = 1.779+0.130 -0.119, and a transition deceleration-acceleration redshift zT = 0.644+0.011 -0.012. Furthermore, the age of the Universe is estimated as tU = 13.788+0.019 -0.019 Gyrs. Finally, we open a discussion if this model could alleviate the H0 and S8 tensions.(c) 2023 Elsevier B.V. All rights reserved.