Cosmological constraints on dark energy in f(Q) gravity: A parametrized perspective
Mussatayeva A. Myrzakulov N. Koussour M.
December 2023Elsevier B.V.
Physics of the Dark Universe
2023#42
In this paper, we focus on the parametrization of the effective equation of state (EoS) parameter within the framework of f(Q) symmetric teleparallel gravity. Here, the gravitational action is represented by an arbitrary function of the non-metricity scalar Q. By utilizing a specific parametrization of the effective EoS parameter and a power-law model of f(Q) theory, namely f(Q)=βQm+1 (where β and m are arbitrary constants), we derive the cosmological solution of the Hubble parameter H(z). To constrain model parameters, we employ recent observational data, including the Observational Hubble parameter Data (OHD), Baryon Acoustic Oscillations data (BAO), and Type Ia supernovae data (SNe Ia). The current constrained value of the deceleration parameter is found to be q0=−0.50−0.01 +0.01, indicating that the current Universe is accelerating. Furthermore, we examine the evolution of the density, EoS, and Om(z) diagnostic parameters to deduce the accelerating nature of the Universe. Finally, we perform a stability analysis with linear perturbations to confirm the models stability.
Cosmological constraints , Dark energy , EoS parameter , f(Q) gravity
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Department of Physics and Chemistry, S. Seifullin Kazakh Agrotechnical University, Astana, 010011, Kazakhstan
L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics, Astana, 010009, Kazakhstan
Quantum Physics and Magnetism Team, LPMC, Faculty of Science Ben Msik, Casablanca Hassan II University, Morocco
Department of Physics and Chemistry
L.N. Gumilyov Eurasian National University
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
Quantum Physics and Magnetism Team
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