New Parametrization of the Dark-Energy Equation of State with a Single Parameter
Singh J.K. Singh P. Saridakis E.N. Myrzakul S. Balhara H.
June 2024Multidisciplinary Digital Publishing Institute (MDPI)
Universe
2024#10Issue 6
We propose a novel dark-energy equation-of-state parametrization, with a single parameter (Formula presented.) that quantifies the deviation from (Formula presented.) CDM cosmology. We first confront the scenario with various datasets, from the Hubble function (OHD), Pantheon, baryon acoustic oscillations (BAO), and their joint observations, and we show that (Formula presented.) has a preference for a non-zero value, namely, a deviation from (Formula presented.) CDM cosmology is favored, although the zero value is marginally inside the 1 (Formula presented.) confidence level. However, we find that the present Hubble function value acquires a higher value, namely, (Formula presented.) Km s−1 Mpc−1, which implies that the (Formula presented.) tension can be partially alleviated. Additionally, we perform a cosmographic analysis, showing that the universe transits from deceleration to acceleration in the recent cosmological past; nevertheless, in the future, it will not result in a de Sitter phase since it exhibits a second transition from acceleration to deceleration. Finally, we perform the statefinder analysis. The scenario behaves similarly to the (Formula presented.) CDM paradigm at high redshifts, while the deviation becomes significant at late and recent times and especially in the future.
cosmological observations , dark-energy , equation-of-state parameter
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Department of Mathematics, Netaji Subhas University of Technology, New Delhi, 110078, India
National Observatory of Athens, Lofos Nymfon, Athens, 11852, Greece
CAS Key Laboratory for Research in Galaxies and Cosmology, University of Science and Technology of China, Hefei, 230026, China
Departamento de Matemáticas, Universidad Católica del Norte, Avda. Angamos 0610, Casilla, Antofagasta, 1280, Chile
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics, Nur-Sultan, 010009, Kazakhstan
Department of Mathematics
National Observatory of Athens
CAS Key Laboratory for Research in Galaxies and Cosmology
Departamento de Matemáticas
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
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