Testing f(Q) Gravity with Logarithmic Equation of State Using Latest Cosmological Data
Abstract
In this paper, we investigate the late-time accelerated expansion of the Universe in power law f(Q) gravity, where a logarithmic dark energy parametrization is considered: ωde(z)=ω0+ω1ln(1+z). This description gives a smooth deviation from a constant equation of state within the complete range of redshifts. We obtain an analytical expression for the Hubble parameter and we use a Markov Chain Monte Carlo to compare the model with the most recent observational data obtained from Pantheon+ Type Ia supernovae, Baryon Acoustic Oscillation measurements from the second data release (DR2) of the Dark Energy Spectroscopic Instrument, and Cosmic Chronometers. We then perform a statistical comparison between our model and the standard ΛCDM model using the Akaike Information Criterion and the Bayesian Information Criterion. From our results, we conclude that the use of logarithmic parametrization in the f(Q) gravity model f(Q)=Q+6γH02(Q/Q0)n is a valid and more flexible alternative to standard dark energy models, as it provides a richer phenomenology at low redshifts.
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BibTeX
@misc{karam2026testing,
title = {{Testing $f(Q)$ Gravity with Logarithmic Equation of State Using Latest Cosmological Data}},
author = {Chaymae Karam and Dalale Mhamdi and Taoufik Ouali and Rachid Ahl Laamara and Mohamed Bennai},
howpublished = {arXiv},
year = {2026},
month = aug,
doi = {10.48550/arxiv.2608.29718},
eprint = {2608.29718},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2608.29718},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Testing f(Q) Gravity with Logarithmic Equation of State Using Latest Cosmological Data
AU - Chaymae Karam
AU - Dalale Mhamdi
AU - Taoufik Ouali
AU - Rachid Ahl Laamara
AU - Mohamed Bennai
PY - 2026
DA - 2026/08/30
PB - arXiv
DO - 10.48550/arxiv.2608.29718
UR - https://arxiv.org/abs/2608.29718
AB - In this paper, we investigate the late-time accelerated expansion of the Universe in power law f(Q) gravity, where a logarithmic dark energy parametrization is considered: ω_de(z)=ω_0+ω_1ln(1+z). This description gives a smooth deviation from a constant equation of state within the complete range of redshifts. We obtain an analytical expression for the Hubble parameter and we use a Markov Chain Monte Carlo to compare the model with the most recent observational data obtained from Pantheon^+ Type Ia supernovae, Baryon Acoustic Oscillation measurements from the second data release (DR2) of the Dark Energy Spectroscopic Instrument, and Cosmic Chronometers. We then perform a statistical comparison between our model and the standard ΛCDM model using the Akaike Information Criterion and the Bayesian Information Criterion. From our results, we conclude that the use of logarithmic parametrization in the f(Q) gravity model f(Q)=Q+6γH_0^2(Q/Q_0)^n is a valid and more flexible alternative to standard dark energy models, as it provides a richer phenomenology at low redshifts.
ER -