A new parametric study of f(T) teleparallel gravity with generalized Chaplygin gas: Confronting observational data
Abstract
In this paper, we investigate the cosmological dynamics of a modified gravity framework based on the function f(T)=β(−T)1/2+γ(−T), where T denotes the torsion scalar. The matter sector is modeled using the Generalized Chaplygin Gas (GCG) with the equation of state p=−𝒜/ρη, allowing the model to describe the evolution from an early-time matter-like phase to a late-time accelerated universe. By deriving an analytical expression for the Hubble parameter H(z), we perform parameter estimation using Bayesian statistical techniques based on the χ2-minimization method with the Cosmic Chronometer (CC) and joint (CC+Pantheon) observational datasets. The deceleration parameter exhibits a transition from deceleration to acceleration, while the present-day value indicates the current accelerated expansion. The model yields a present-day EoS parameter consistent with dark-energy-like behavior, while the energy conditions indicate that the NEC and DEC are satisfied and the SEC is violated at late times. The ω−ω' plane shows a freezing quintessence behavior, approaching the ΛCDM-like point (ω,ω')=(−1,0), while the cosmographic analysis offers additional insight into the evolution of the cosmic expansion. The estimated age of the universe is also consistent with current observational bounds. These results demonstrate that the GCG scenario within f(T) teleparallel gravity provides a viable and observationally consistent framework for explaining the late-time accelerated expansion of the universe.
Related
- Kantowski Sachs Cosmological Model with Radiation and Generalized Chaplygin Gas
- The Umami Chaplygin Gas as a Unified Dark Fluid: Observational Constraints, Perturbative and Thermodynamic Stability Analysis
- Foldy--Wouthuysen Transformation of the Generalized Dirac Equation in Symmetric Teleparallel Gravity
- Proper generalized decomposition with synthetic preconditioning for multiscale parametric phonon transport
- Constructions of Variable Modified Chaplygin-Jacobi and Chaplygin-Abel Gases from Geometrothermodynamics
BibTeX
@misc{patle2026parametric,
title = {{A new parametric study of $f(T)$ teleparallel gravity with generalized Chaplygin gas: Confronting observational data}},
author = {Khomesh R. Patle and G. P. Singh},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.13897},
eprint = {2609.13897},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.13897},
}
RIS
TY - UNPB
TI - A new parametric study of f(T) teleparallel gravity with generalized Chaplygin gas: Confronting observational data
AU - Khomesh R. Patle
AU - G. P. Singh
PY - 2026
DA - 2026/09/12
PB - arXiv
DO - 10.48550/arxiv.2609.13897
UR - https://arxiv.org/abs/2609.13897
AB - In this paper, we investigate the cosmological dynamics of a modified gravity framework based on the function f(T)=β(−T)^1/2+γ(−T), where T denotes the torsion scalar. The matter sector is modeled using the Generalized Chaplygin Gas (GCG) with the equation of state p=−𝒜/ρ^η, allowing the model to describe the evolution from an early-time matter-like phase to a late-time accelerated universe. By deriving an analytical expression for the Hubble parameter H(z), we perform parameter estimation using Bayesian statistical techniques based on the χ^2-minimization method with the Cosmic Chronometer (CC) and joint (CC+Pantheon) observational datasets. The deceleration parameter exhibits a transition from deceleration to acceleration, while the present-day value indicates the current accelerated expansion. The model yields a present-day EoS parameter consistent with dark-energy-like behavior, while the energy conditions indicate that the NEC and DEC are satisfied and the SEC is violated at late times. The ω−ω' plane shows a freezing quintessence behavior, approaching the ΛCDM-like point (ω,ω')=(−1,0), while the cosmographic analysis offers additional insight into the evolution of the cosmic expansion. The estimated age of the universe is also consistent with current observational bounds. These results demonstrate that the GCG scenario within f(T) teleparallel gravity provides a viable and observationally consistent framework for explaining the late-time accelerated expansion of the universe.
ER -