Generalized Ghost Dark Energy Model in Extended Modified Theory of Symmetric Telleparallel Gravity

Abstract

This paper focuses on developing a generalized ghost dark energy model $f(\mathcal{Q},\mathcal{T})$ through the correspondence scheme for a non-interacting scenario involving pressureless matter and a power-law scale factor. We analyze the cosmological implications of our model using the equation of state parameter, ${\omega }_{GGDE}-{\omega }_{GGDE}^{\prime }$ and the $r-s$ planes. We also examine stability of the model by considering squared speed of sound parameter. The equation of state parameter shows the phantom era, while the squared speed of sound indicates a stable generalized ghost dark energy model throughout the cosmic evolution. The ${\omega }_{GGDE}-{\omega }_{GGDE}^{\prime }$ plane depicts a freezing region, whereas the $r-s$ plane corresponds to the Chaplygin gas model. We conclude that our results are consistent with the current observational data.

30 pages, 6 figures. arXiv admin note: text overlap with arXiv:2405.04548