Akademik Veri Yönetim Sistemi
Annals of Physics, cilt.483, 2025 (SCI-Expanded, Scopus)
In this paper, we construct an isotropic cosmological model in the f(Q,T) theory of gravity in the frame of a flat FLRW spacetime, with Q the non-metricity tensor and T the trace of the energy–momentum tensor. The gravity function is taken to be a quadratic equation, f(Q,T)=ζQ2+γT, where ζ<0 and γ are the arbitrary constants. We constrain the model parameters α arising while solving the deceleration parameter q as an integration constant together with the present value of the Hubble parameter H0 using the Hubble datasets (OHD), the Pantheon of 1048 data points, and the joint datasets (OHD + Pantheon). The universe model transitions from an early deceleration state to an acceleration in late times. This model also provides the ekpyrotic phase of the universe on the redshift z>12.32. In this model, the Big Bang is described as a collision of branes, and thus, the Big Bang is not the beginning of time. Before the Big Bang, there is an ekpyrotic phase with the equation of state ω>>1. In late times, the undeviating Hubble measurements reduce the H0 tension in the reconstructed f(Q,T) function. Additionally, we study various physical parameters of the model. Finally, our model describes a quintessence dark energy model at later times.