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Can f(Q) gravity challenge ΛCDM?

L. Atayde, N. Frusciante

We study observational constraints on the nonmetricity f(Q)-gravity which reproduces an exact ΛCDM background expansion history while modifying the evolution of linear perturbations. To this purpose we use cosmic microwave background (CMB) radiation, baryonic acoustic oscillations (BAO), redshift-space distortions (RSD), supernovae type Ia (SNIa), galaxy clustering (GC) and weak gravitational lensing (WL) measurements. We set stringent constraints on the parameter of the model controlling the modifications to the gravitational interaction at linear perturbation level. We find the model to be statistically preferred by data over the ΛCDM according to the χ2 and deviance information criterion statistics for the combination with CMB, BAO, RSD and SNIa. This is mostly associated to a better fit to the low-ℓ tail of CMB temperature anisotropies.

Astrophysics - Cosmology and Nongalactic Astrophysics; General Relativity and Quantum Cosmology

Physical Review D
Volume 104, Issue 6
2021 September

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia