Testing the viability of f(T,J ) gravity models via effective equation of state constraints
Koussour M. Donmez O. Bekov S. Syzdykova A. Muminov S. Ashirova A.I.
1 December 2025World Scientific
International Journal of Geometric Methods in Modern Physics
2025#22Issue 14
This paper rigorously examines the potential of the f(T,J ) theory as a promising framework for understanding the dark sector of the universe, particularly in relation to cosmic acceleration. The f(T,J ) theory extends gravitational dynamics by incorporating both the torsion scalar T and the trace of the energy-momentum tensor J. Further, we explore the functional form f(T,J ) = T + βJ, where β is a free parameter that modulates the matter’s influence on spacetime evolution. To evaluate this model, we employ an effective EoS parameter dependent on redshift z, to solve the field equations and analyze the evolution of the Hubble parameter H(z). Using a joint dataset (H(z) + Pantheon+) and the Markov Chain Monte Carlo (MCMC) method with Bayesian analysis, we obtain the best-fit parameter values: H0 = 68.04 ± 0.64, β = 0.14 ± 0.17 and γ = 0.96−0.69+0.38, which align well with current observational data. Our findings indicate a deceleration parameter of q0 = −0.51, supporting a present-day accelerated expansion phase, with a transition redshift zt = 0.57 marking the universe’s shift from deceleration to acceleration. Moreover, we confirm a positive cosmic fluid energy density, reinforcing stability, and find an EoS parameter value of ω0 = −0.76, consistent with quintessence-driven acceleration. These results underscore the viability of f(T,J ) as a robust framework for addressing the accelerating universe and dark energy dynamics, paving the way for future investigations into its cosmological implications.
cosmic acceleration , dark energy , equation of state , f(T,J ) gravity , MCMC , observational cosmology , quintessence
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Department of Physics, University of Hassan II Casablanca, Morocco
College of Engineering and Technology, American University of the Middle East, Egaila, 54200, Kuwait
Department of General and Theoretical Physics, L.N. Gumilyov Eurasian National University, Astana, 010008, Kazakhstan
Kozybayev University, Petropavlovsk, 150000, Kazakhstan
Mamun University, Bolkhovuz Street 2, Khiva, 220900, Uzbekistan
Department of Physics
College of Engineering and Technology
Department of General and Theoretical Physics
Kozybayev University
Mamun University
10 лет помогаем публиковать статьи Международный издатель
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