Cosmic expansion beyond $\Lambda$CDM: Investigating power-law and logarithmic corrections

Abstract

The cosmic acceleration observed in the expansion of the Universe has sparked extensive research into the nature of dark energy, which is known to constitute approximately 70\% of the Universe's energy content. In this study, we explore two parametrizations of the Hubble parameter, namely power-law and logarithmic corrections, as alternatives to the standard $\Lambda$CDM model. Using observational data from Cosmic Chronometers (CC), Pantheon+, and the Baryonic Acoustic Oscillations (BAO) datasets, we investigate the dynamics of essential cosmological parameters, including the deceleration parameter, energy density, pressure, and equation of state (EoS) parameter. The $Om(z)$ diagnostic test is employed to classify different dark energy models. Our cosmological models, with the power-law and logarithmic corrections, are found to provide a good fit to the recent observational data and efficiently describe the cosmic expansion scenario.

The European Physical Journal Plus accepted version

References in corpus (24)

• Dynamics of dark energy
• The Confrontation between General Relativity and Experiment
• A Comprehensive Measurement of the Local Value of the Hubble Constant with 1 km/s/Mpc Uncertainty from the Hubble Space Telescope and the SH0ES Team
• The Pantheon+ Analysis: Cosmological Constraints
• Raising the bar: new constraints on the Hubble parameter with cosmic chronometers at z$\sim$2
• The Pantheon+ Analysis: The Full Dataset and Light-Curve Release
• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Two new diagnostics of dark energy
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• WMAP constraints on low redshift evolution of dark energy
• Large Scale Structure as a Probe of Gravitational Slip
• Gaussian Process Cosmography
• Reconstruction of the deceleration parameter and the equation of state of dark energy
• The Pantheon+ Analysis: SuperCal-Fragilistic Cross Calibration, Retrained SALT2 Light Curve Model, and Calibration Systematic Uncertainty
• Energy conditions bounds on f(T) gravity
• Autonomous Dynamical System Approach for $f(R)$ Gravity
• Anisotropic nature of space-time in $f(Q)$ gravity
• Three thermodynamically-based parametrizations of the deceleration parameter
• Using Pantheon and DES supernova, baryon acoustic oscillation, and Hubble parameter data to constrain the Hubble constant, dark energy dynamics, and spatial curvature
• A new parametrization of Hubble parameter in $f(Q)$ gravity
• Accelerating Universe scenario in anisotropic $f\left(Q\right)$ cosmology
• A New $Om(z)$ Diagnostic of Dark Energy in General Relativity Theory
• Reconstruction of interaction rate in Holographic dark energy model with Hubble horizon as the infrared cut-off
• Running of the Spectral Index and Inflationary Dynamics of $F(R)$ Gravity

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