Observational analysis of late-time acceleration in f(Q,Lm) gravity
Myrzakulov K. Koussour M. Donmez O. Cilli A. Güdekli E. Rayimbaev J.
November 2024Elsevier B.V.
Journal of High Energy Astrophysics
2024#44164 - 171 pp.
In this study, we explored late-time cosmology within an extended class of theories based on f(Q,Lm) gravity. This theory generalizes f(Q) gravity by incorporating a non-minimal coupling between the non-metricity Q and the matter Lagrangian Lm, analogous to the f(Q,T) theory. The coupling between Q and Lm leads to the non-conservation of the matter energy-momentum tensor. We first investigated a cosmological model defined by the functional form f(Q,Lm)=αQ+βLmn, where α, β, and n are constants. The derived Hubble parameter [Formula presented] indicates that n significantly influences the scaling of H(z) over cosmic history, with n>2 suggesting accelerated expansion. We also examined the simplified case of n=1, leading to the linear form f(Q,Lm)=αQ+βLm, consistent with a universe dominated by non-relativistic matter. Using various observational datasets, including H(z) and Pantheon, we constrained the model parameters. Our analysis showed that the f(Q,Lm) model aligns well with observational results and exhibits similar behavior to the ΛCDM model. The results, with q0=−0.22±0.01 across all datasets, indicate an accelerating universe, highlighting the models potential as an alternative to ΛCDM.
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
Department of Physics, University of Hassan II, Casablanca, Morocco
College of Engineering and Technology, American University of the Middle East, Egaila, 54200, Kuwait
Yildiz Technical University, Department of Physics, Istanbul, 34220, Turkey
Department of Physics, Istanbul University, Istanbul, 34134, Turkey
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
Urgench State University, Kh. Alimjan Str. 14, Urgench, 221100, Uzbekistan
Shahrisabz State Pedagogical Institute, Shahrisabz Str. 10, Shahrisabz, 181301, Uzbekistan
Tashkent State Technical University, Tashkent, 100095, Uzbekistan
Department of General & Theoretical Physics
Department of Physics
College of Engineering and Technology
Yildiz Technical University
Department of Physics
Institute of Fundamental and Applied Research
University of Tashkent for Applied Sciences
Urgench State University
Shahrisabz State Pedagogical Institute
Tashkent State Technical University
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