Signatures of $f(Q)$-gravity in cosmology

Abstract

We investigate the impact on cosmological observables of $f(Q)$-gravity, a specific class of modified gravity models in which gravity is described by the non-metricity scalar, $Q$. In particular we focus on a specific model which is indistinguishable from the $\Lambda$-cold-dark-matter ($\Lambda$CDM) model at the background level, while showing peculiar and measurable signatures at linear perturbation level. These are attributed to a time-dependent Planck mass and are regulated by a single dimensionless parameter, $\alpha$. In comparison to the $\Lambda$CDM model, we find for positive values of $\alpha$ a suppressed matter power spectrum and lensing effect on the Cosmic Microwave Background radiation (CMB) angular power spectrum and an enhanced integrated-Sachs-Wolfe tail of CMB temperature anisotropies. The opposite behaviors are present when the $\alpha$ parameter is negative. We also investigate the modified Gravitational Waves (GWs) propagation and show the prediction of the GWs luminosity distance compared to the standard electromagnetic one. Finally, we infer the accuracy on the free parameter of the model with standard sirens at future GWs detectors.

8 pages, 6 figures, accepted for publication in PRD

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• Energy condition bounds on $f(Q)$ model parameters in a curved FLRW universe
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• Cosmological study of a symmetric teleparallel gravity model
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• Barrow holographic dark energy models in $f\left(Q\right)$ symmetric teleparallel gravity with Lambert function distribution
• Symmetric Teleparallel Gauss-Bonnet Gravity and its Extensions
• Cosmological implications of non-minimally coupled f(Q) gravity
• A note on the junction conditions in f(Q)-gravity
• Quantum Cosmology in $f(Q)$ theory