Cosmological implications of the constant jerk parameter in f(Q,T) gravity theory
Myrzakulov N. Koussour M. Alfedeel A.H.A. Elkhair H.M.
December 2023Elsevier B.V.
Chinese Journal of Physics
2023#86300 - 312 pp.
This study delves into modified gravity theories that are equivalent to General Relativity but involve the torsion or non-metricity scalar instead of the curvature scalar. Specifically, we focus on f(Q,T) gravity, which entails an arbitrary function of the non-metricity scalar Q non-minimally coupled to the trace of the stress–energy tensor T. We investigate the functional form f(Q,T)=f(Q)+f(T), where f(Q)=Q+αQ2 represents the Starobinsky model in f(Q) gravity and f(T)=2γT, with α and γ are constants. To obtain solutions for the Friedmann equations, we introduce the concept of a constant jerk and employ its definition to trace the evolution of other kinematic variables, including the deceleration parameter, energy density, EoS parameter, and various energy conditions. These analyses serve to validate the proposed model. We constrain our constant jerk model using the most available Pantheon set of data, the Hubble set of data, and the BAO set of data. Further, we employ Om(z) diagnostic as a means to differentiate between different theories of dark energy. Throughout our examination, all cosmological parameters under scrutiny consistently indicate an accelerating Universe.
Dark Energy , f(Q,T) gravity , Jerk parameter , Observational constraints
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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 Mathematics and Statistics, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, 13318, Saudi Arabia
Department of Physics, Faculty of Science, University of Khartoum, P.O. Box 321, Khartoum, 11115, Sudan
Centre for Space Research, North-West University, Potchefstroom, 2520, South Africa
Deanship of Scientific Research, Imam Mohammad Ibn Saud Islamic University (IMSIU), P. O Bx 5701, Riyadh, 11432, Saudi Arabia
L. N. Gumilyov Eurasian National University
Ratbay Myrzakulov Eurasian International Centre for Theoretical Physics
Quantum Physics and Magnetism Team
Department of Mathematics and Statistics
Department of Physics
Centre for Space Research
Deanship of Scientific Research
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