English

Weyl type $f(Q,T)$ gravity observational constrained cosmological model

General Relativity and Quantum Cosmology 2023-06-02 v1 High Energy Physics - Theory

Abstract

In this paper, we have studied the dynamical aspects of the cosmological model of the Universe in the Weyl type f(Q,T)f(Q,T) gravity, which is an extension of symmetric teleparallel gravity. The non-metricity scalar QQ has been expressed in standard Weyl form and can be determined by a vector field wμw_{\mu} and the trace of energy momentum tensor denoted as TT. The logarithmic form of the Hubble parametrization has been incorporated and the best fit values of the free parameters have been determined using 32 CC32~CC sample points, 1701 Pantheon+1701~Pantheon^{+} and 6 BAO6~BAO data points. The present value of the H070.2±4.6H_{0}\approx 70.2\pm 4.6, H068.690.59+0.67H_{0}\approx 68.69_{-0.59}^{+0.67} and H069.260.53+0.57H_{0}\approx 69.26_{-0.53}^{+0.57} respectively for CC SampleCC~Sample, CC+Pantheon+CC + Pantheon^{+} and CC+Pantheon++BAOCC + Pantheon^{+} + BAO datasets. With the constrained values of the free parameters, the cosmographic parameters are constrained and the present value of each parameter has been noted. The deceleration parameter for CC SampleCC~Sample, CC+Pantheon+CC + Pantheon^{+} and CC+Pantheon++BAOCC + Pantheon^{+} + BAO datasets provides 0.5221-0.5221, 0.5477-0.5477 and 0.5691-0.5691 respectively at present time. We have considered exponential and non-linear form of the Weyl type function f(Q,T)f(Q,T) to assess the dynamical behaviour of the model. The accelerating cosmological models show the quintessence behaviour at present time as we get the present EoS parameter values obtained as ω0.7068\omega\approx -0.7068 and ω0.6828\omega\approx -0.6828 for CC SampleCC~Sample, ω0.6991\omega\approx -0.6991 and 0.6949-0.6949 for CC+Pantheon+CC + Pantheon^{+} and ω0.7001\omega\approx -0.7001 and 0.7084-0.7084 for CC+Pantheon++BAOCC + Pantheon^{+} + BAO respectively.

Keywords

Cite

@article{arxiv.2305.01659,
  title  = {Weyl type $f(Q,T)$ gravity observational constrained cosmological model},
  author = {Rahul Bhagat and S. A. Narawade and B. Mishra},
  journal= {arXiv preprint arXiv:2305.01659},
  year   = {2023}
}

Comments

14 pages, 11 Figures. Accepted version: Physics of the Dark Universe

R2 v1 2026-06-28T10:23:47.938Z