Late-time cosmology in f(Q,Lm) gravity: Analytical solutions and observational fits


Myrzakulov Y. Donmez O. Koussour M. Alizhanov D. Bekchanov S. Rayimbaev J.
December 2024Elsevier B.V.

Physics of the Dark Universe
2024#46

In this study, we examined the late-time cosmic expansion of the universe within the framework of f(Q,Lm) gravity, where Q denotes the non-metricity and Lm represents the matter Lagrangian. We analyzed a linear f(Q,Lm) model of the form f(Q,Lm)=−αQ+2Lm+β. Using MCMC methods, we constrained the model parameters H0, α, and β with various datasets, including H(z), Pantheon+SH0ES, and BAO data. For the H(z) dataset, we found H0=67.90±0.66, α=0.1072−0.0069+0.0054, and β=−1988.2±1.0. For the Pantheon+SH0ES dataset, H0=70.05±0.68, α=0.0916−0.0033+0.0028, and β=−1988.3±1.0. For the BAO dataset, H0=68.1±1.0, α=0.1029−0.0052+0.0041, and β=−1988.24±0.99. Moreover, the energy density remains positive and approaches zero in the distant future, and the deceleration parameter indicates a transition from deceleration to acceleration, with transition redshifts of zt=0.60, zt=0.78, and zt=0.66 for the respective datasets. These findings align with previous observational studies and contribute to our understanding of the universes expansion dynamics.

Deceleration parameter , Energy density , f(Q, Lm) gravity , Late-time cosmology , Observational constraints

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Department of General & Theoretical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
College of Engineering and Technology, American University of the Middle East, Egaila, 54200, Kuwait
Department of Physics, University of Hassan II Casablanca, Morocco
Department of Physics, Namangan State University Boburshokh Str. 161, Namangan, 160107, Uzbekistan
Computer science department, Urgench State University, Kh. Alimjan str. 14, Urgench, 221100, Uzbekistan
Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, Tashkent, 100000, Uzbekistan
University of Tashkent for Applied Sciences, Str. Gavhar 1, Tashkent, 100149, Uzbekistan
Shahrisabz State Pedagogical Institute, Shahrisabz Str. 10, Shahrisabz, 181301, Uzbekistan
Tashkent State Technical University, Tashkent, 100095, Uzbekistan

Department of General & Theoretical Physics
College of Engineering and Technology
Department of Physics
Department of Physics
Computer science department
Institute of Fundamental and Applied Research
University of Tashkent for Applied Sciences
Shahrisabz State Pedagogical Institute
Tashkent State Technical University

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