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 the non-metricity tensor and the trace of the energy-momentum tensor. The gravity function is taken to be a quadratic equation, f(Q, T) =zeta Q(2)+gamma T,where zeta <0 and gamma are the arbitrary constants. We constrain the model parameters arising while solving the deceleration parameter as an integration constant together with the present value of the Hubble parameter using the Hubble datasets (OHD), the of 1048 data points, and the joint datasets (OHD + ). 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 omega >>1 . In late times, the undeviating Hubble measurements reduce the 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.