Linear redshift parametrization of deceleration parameter in f(R,Lm) gravity
Myrzakulov Y. Donmez O. Yildiz G.D.A. Güdekli E. Muminov S. Rayimbaev J.
July 2024Elsevier B.V.
Physics of the Dark Universe
2024#45
In this study, we investigate the linear redshift parametrization of q(z) within the framework of f(R,Lm) gravity, using constraints derived from H(z)/Pantheon samples. We consider a non-linear functional form for f(R,Lm), specifically given by [Formula presented], where n represents a free parameter in the model. Subsequently, we derive the solution for the Hubble parameter by investigating the parametrization of q(z) and then apply this solution to the modified Friedmann equations. Our analysis focuses on exploring the behavior of the EoS parameter across different stages of the universes evolution, including radiation, matter, and dark energy eras. Furthermore, our results confirm the quintessence nature of the universes current accelerated expansion phase ([Formula presented]>), supporting the role of quintessence in driving the universes current acceleration. We also explore the redshift dependence of the deceleration parameter, statefinder, Om(z) diagnostics, energy density, pressure, and energy conditions to determine the universes accelerating behavior. Importantly, our findings suggest that the linear redshift parametrization of q(z), supported by additional terms in f(R,Lm) gravity, provides a compelling alternative to the cosmological constant.
Dark energy , Deceleration parameter , f(R,Lm) gravity , Observational constraints
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Department of General & Theoretical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Ratbay Myrzakulov Eurasian International Center for Theoretical Physics, Astana, 010009, Kazakhstan
College of Engineering and Technology, American University of the Middle East, Egaila, 54200, Kuwait
Graduate School of Engineering and Science, Istanbul University, Istanbul, 34134, Turkey
Department of Physics, Faculty of Science and Letters, Piri Reis University, Istanbul, Tuzla, 34940, Turkey
Department of Physics, Istanbul University, Istanbul, 34134, Turkey
Urgench State University, Kh. Alimjan str. 14, Urgench, 221100, Uzbekistan
New Uzbekistan University, Mustaqillik Ave. 54, Tashkent, 100007, Uzbekistan
University of Tashkent for Applied Sciences, Gavhar Str. 1, Tashkent, 100149, Uzbekistan
National University of Uzbekistan, Tashkent, 100174, Uzbekistan
Department of General & Theoretical Physics
Ratbay Myrzakulov Eurasian International Center for Theoretical Physics
College of Engineering and Technology
Graduate School of Engineering and Science
Department of Physics
Department of Physics
Urgench State University
New Uzbekistan University
University of Tashkent for Applied Sciences
National University of Uzbekistan
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