Diagnostics of dark energy evolution using logarithmic Om(z) parameterization
Myrzakulov Y. Alfedeel A.H.A. Koussour M. Hassan E.I. Muminov S.
July 2025Elsevier B.V.
Journal of High Energy Astrophysics
2025#47
In this study, we explore the logarithmic Om(z) parameterization as a tool for diagnosing the nature and evolution of dark energy. We propose the form Om(z)=αln(1+z)+β, where α and β are free parameters, and analyze its behavior for different values of α. When α=0, the model reduces to a constant, consistent with the cosmological constant, while α≠0 indicates dynamical dark energy, with α>0 suggesting phantom-like behavior and α<0 indicating quintessence-like dynamics. By constraining the model parameters using observational datasets such as OHD, the Pantheon+ sample, and the combined dataset (OHD+SNe+BAO), we obtain tight constraints on the cosmic evolution. Our results suggest a mild deviation from the standard ΛCDM model, with a slight preference for phantom-like behavior at low redshifts. The deceleration parameter and equation of state parameter were analyzed to understand the cosmic transition from deceleration to acceleration, with a transition redshift around ztr≈0.6−0.8. The present-day deceleration parameter was found to range from q0=−0.55 to q0=−0.60, and the EoS parameter values varied between ω0=−0.70 and ω0=−0.73. The inferred Hubble constant values exhibit dataset-dependent variations, highlighting the persistent Hubble tension. Our analysis suggests that the logarithmic Om(z) parameterization offers a flexible framework for studying cosmic acceleration.
Cosmology , Dark energy , Deceleration parameter , EoS parameter, and observational data , Om(z) diagnostic
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Department of General & Theoretical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Mathematics and Statistics, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 13318, Saudi Arabia
Department of Physics, University of Hassan II, Casablanca, Morocco
Mamun University, Bolkhovuz Street 2, Khiva, 220900, Uzbekistan
Department of General & Theoretical Physics
Department of Mathematics and Statistics
Department of Physics
Mamun University
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