Constraints on anisotropic properties of the universe in f(Q,T) gravity theory
Zhadyranova A. Koussour M. Zhumabekova V. Donmez O. Muminov S. Rayimbaev J.
November 2024Elsevier B.V.
Journal of High Energy Astrophysics
2024#44123 - 131 pp.
Motivated by anomalies in cosmic microwave background observations, we investigate the implications of f(Q,T) gravity in Bianchi type-I spacetime, aiming to characterize the universes spatially homogeneous and anisotropic properties. By using a linear combination of non-metricity Q and the energy-momentum tensor trace T, we parametrize the deceleration parameter and derive the Hubble solution, which we then impose in the Friedmann equations of f(Q,T) gravity. Bayesian analysis is employed to find the best-fit values of model parameters, with 1−σ and 2−σ contour plots illustrating the constraints from observational data, including H(z) data and the Pantheon+ sample. Our analysis reveals a transition from a decelerated to an accelerated expansion phase, with the present deceleration parameter indicating an accelerating universe. The energy density gradually decreases over time, approaching zero for the present and future, indicating continuous expansion. The anisotropic pressure, initially notably negative, transitions to slightly negative values, suggesting the presence of dark energy. The evolving equation of state parameter ω exhibits behavior akin to phantom energy, influenced by spacetime anisotropy. Violations of the null energy condition and the strong energy condition imply phantom-like behavior and accelerated expansion.
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General and Theoretical Physics Department, L. N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Department of Physics, University of Hassan II, Casablanca, Morocco
Theoretical, Nuclear Physics Department, Al-Farabi Kazakh National University, Almaty, 050040, Kazakhstan
College of Engineering and Technology, American University of the Middle East, Egaila, 54200, Kuwait
Mamun University, Bolkhovuz Street 2, Khiva, 220900, 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
Urgench State University, Kh. Alimjan Str. 14, Urgench, 221100, Uzbekistan
Shahrisabz State Pedagogical Institute, Shahrisabz Str. 10, Shahrisabz, 181301, Uzbekistan
General and Theoretical Physics Department
Department of Physics
Theoretical
College of Engineering and Technology
Mamun University
Institute of Fundamental and Applied Research
University of Tashkent for Applied Sciences
Urgench State University
Shahrisabz State Pedagogical Institute
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