RSD constraints on power-law f(Q) gravity using Barboza-Alcaniz and Jassal-Bagla-Padmanabhan parametrizations
Abstract
We investigate the late-time accelerated expansion of the Universe in power-law f(Q) gravity, f(Q) = Q + 6γH02 (Q/Q0)n, combined with two dynamical dark energy parametrizations, Barboza-Alcaniz (BA) and Jassal-Bagla-Padmanabhan (JBP), which allow a smooth evolution of the equation of state beyond the standard constant ω assumption. We derive analytical expressions for the Hubble parameter and the dark energy density, and constrain the model using Pantheon+ Type Ia Supernovae, DESI DR2 Baryon Acoustic Oscillations, and Cosmic Chronometers. Going beyond purely geometrical probes, we incorporate Redshift Space Distortion (RSD) measurements to test the growth of cosmic structures and distinguish modified gravity from General Relativity through the effective Newton's constant. Both parametrizations reproduce the observed late-time acceleration and remain consistent with growth data, with only mild deviations from ΛCDM over low and intermediate redshifts. Notably, both configurations yield Geff < G, indicating suppressed growth of matter perturbations. These results establish power-law f(Q) gravity with BA and JBP parametrizations as a viable and versatile alternative to ΛCDM across both background and perturbative regimes.
Related
- Big Bang nucleosynthesis constraints on f(Q,C) gravity
- Inflationary models in a minimally coupled f(R,T) gravity: Constraints from Planck, BICEP/Keck, and ACT
- Nonlocal Gravity, Restricted CPL Dynamics and DESI Constraints
- Gravitational-Wave Constraints on R2 Gravity
- Constraints on Horndeski gravity with phantom crossing
BibTeX
@misc{karam2026constraints,
title = {{RSD constraints on power-law $f(Q)$ gravity using Barboza-Alcaniz and Jassal-Bagla-Padmanabhan parametrizations}},
author = {Chaymae karam and Dalale Mhamdi and Taoufik Ouali and Rachid Ahl Laamara and Mohamed Bennai},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.10597},
eprint = {2609.10597},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.10597},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - RSD constraints on power-law f(Q) gravity using Barboza-Alcaniz and Jassal-Bagla-Padmanabhan parametrizations
AU - Chaymae karam
AU - Dalale Mhamdi
AU - Taoufik Ouali
AU - Rachid Ahl Laamara
AU - Mohamed Bennai
PY - 2026
DA - 2026/09/07
PB - arXiv
DO - 10.48550/arxiv.2609.10597
UR - https://arxiv.org/abs/2609.10597
AB - We investigate the late-time accelerated expansion of the Universe in power-law f(Q) gravity, f(Q) = Q + 6γH_0^2 (Q/Q_0)^n, combined with two dynamical dark energy parametrizations, Barboza-Alcaniz (BA) and Jassal-Bagla-Padmanabhan (JBP), which allow a smooth evolution of the equation of state beyond the standard constant ω assumption. We derive analytical expressions for the Hubble parameter and the dark energy density, and constrain the model using Pantheon^+ Type Ia Supernovae, DESI DR2 Baryon Acoustic Oscillations, and Cosmic Chronometers. Going beyond purely geometrical probes, we incorporate Redshift Space Distortion (RSD) measurements to test the growth of cosmic structures and distinguish modified gravity from General Relativity through the effective Newton's constant. Both parametrizations reproduce the observed late-time acceleration and remain consistent with growth data, with only mild deviations from ΛCDM over low and intermediate redshifts. Notably, both configurations yield G_eff < G, indicating suppressed growth of matter perturbations. These results establish power-law f(Q) gravity with BA and JBP parametrizations as a viable and versatile alternative to ΛCDM across both background and perturbative regimes.
ER -