Observational constraints on parameterized deceleration parameter with f(Q, T) gravity

Shekh S. H., Caliskan A., Mustafa G., Maurya S. K., Pradhan A., Gudekli E.

International Journal of Geometric Methods in Modern Physics, vol.21, no.3, 2024 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 3
  • Publication Date: 2024
  • Doi Number: 10.1142/s0219887824500543
  • Journal Name: International Journal of Geometric Methods in Modern Physics
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Communication Abstracts, Metadex, zbMATH, Civil Engineering Abstracts
  • Keywords: cosmic acceleration, dark energy, f(Q, T) gravity, Isotropic homogeneous line element
  • Istanbul University Affiliated: Yes


In the current analysis, we considered a spatially flat FRW universe with f(Q, T) gravity. To understand the dark energy via the equation of state, we start with the phenomenological parametrization of the deceleration parameter q(z). One of the most preferred parametrizations of the dark energy equation of state served as the idea for the deceleration parameter. The best-fit value of zt (the redshift at which the universe transitions from before decelerating to the present accelerating phase) and the current value of the deceleration parameter are explored. The negative behavior indicates that the universe is accelerating, which can be verified from the combined datasets (CC + SC + unCor BAO). Additionally, we examine the current scenario of the well-reconstructed q(z) and ω(z) fitting behavior via ΛCDM. As we are working within f(Q, T) gravity, so, two specific models like f(Q, T) = αQ + βT and f(Q, T) = α1Q2 + β1T with α, α1, β model parameters are considered to complete the current analysis. Last, we have concluding remarks regarding the current analysis.