QCD ghost f(T)-gravity model

TL;DR

This paper develops a modified teleparallel gravity model based on QCD ghost dark energy, demonstrating its consistency with observational data, thermodynamics, and structure formation, and showing it can describe the universe's evolution.

Contribution

The paper reconstructs a novel f(T) gravity model linked to QCD ghost dark energy and tests its viability against observational and thermodynamic constraints.

Findings

The model describes a universe transitioning from matter dominance to de Sitter expansion.

It is consistent with SNeIa, CMB, BAO data, and passes cosmographic and thermodynamic tests.

The growth rate of matter perturbations aligns with ΛCDM predictions.

Abstract

Within the framework of modified teleparallel gravity, we reconstruct a f(T) model corresponding to the QCD ghost dark energy scenario. For a spatially flat FRW universe containing only the pressureless matter, we obtain the time evolution of the torsion scalar T (or the Hubble parameter). Then, we calculate the effective torsion equation of state parameter of the QCD ghost f(T)-gravity model as well as the deceleration parameter of the universe. Furthermore, we fit the model parameters by using the latest observational data including SNeIa, CMB and BAO data. We also check the viability of our model using a cosmographic analysis approach. Moreover, we investigate the validity of the generalized second law (GSL) of gravitational thermodynamics for our model. Finally, we point out the growth rate of matter density perturbation. We conclude that in QCD ghost f(T)-gravity model, the universe begins a matter dominated phase and approaches a de Sitter regime at late times, as expected. Also this model is consistent with current data, passes the cosmographic test, satisfies the GSL and fits the data of the growth factor well as the LCDM model.