Square-root parametrization of dark energy in f(Q) cosmology
Koussour M. Myrzakulov N. Alfedeel A.H.A. Hassan E.I. Sofuoğlu D. M Mirgani S.
1 December 2023Institute of Physics
Communications in Theoretical Physics
2023#75Issue 12
This paper is a parametrization of the equation of state (EoS) parameter of dark energy (DE), which is parameterized using square-root (SR) form i.e. ω SR = ω 0 + ω 1 z z 2 + 1 , where ω 0 and ω 1 are free constants. This parametrization is examined in the context of the recently suggested f(Q) gravity theory as an alternative to general relativity (GR), in which gravitational effects are attributed to the non-metricity scalar Q with the functional form f(Q) = Q + α Q n , where α and n are arbitrary constants. We derive observational constraints on model parameters using the Hubble dataset with 31 data points and the Supernovae (SNe) dataset from the Pantheon samples compilation dataset with 1048 data points. For the current model, the evolution of the deceleration parameter, density parameter, EoS for DE, and Om(z) diagnostic have all been investigated. It has been shown that the deceleration parameter favors the current accelerated expansion phase. It has also been shown that the EoS parameter for DE has a quintessence nature at this time.
cosmology , dark energy , EoS parameter , f(Q) gravity
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Quantum Physics and Magnetism Team, LPMC, Faculty of Science Ben M’sik, Casablanca Hassan II University, Morocco
L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics, Astana, 010009, Kazakhstan
Department of Mathematics and Statistics, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 13318, Saudi Arabia
Department of Physics, Faculty of Science, University of Khartoum, PO Box 321, Khartoum, 11115, Sudan
Centre for Space Research, North-West University, Potchefstroom, 2520, South Africa
Department of Physics, Istanbul University, Vezneciler, Fatih, Istanbul, 34134, Turkey
Quantum Physics and Magnetism Team
L.N. Gumilyov Eurasian National University
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
Department of Mathematics and Statistics
Department of Physics
Centre for Space Research
Department of Physics
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