http://arxiv.org/abs/2104.15123
We propose a novel model in the framework of $f(Q)$ gravity, which is a gravitational modification class arising from the incorporation of non-metricity. The model has General Relativity as a particular limit, it has the same number of free parameters to those of $\Lambda$CDM, however at a cosmological framework it gives rise to a scenario that does not have $\Lambda$CDM as a limit. Nevertheless, confrontation with observations at both background and perturbation levels, namely with Supernovae type Ia (SNIa), Baryonic Acoustic Oscillations (BAO), cosmic chronometers (CC), and Redshift Space Distortion (RSD) data, reveals that the scenario, according to AIC, BIC and DIC information criteria, is at some cases statistically preferred comparing to $\Lambda$CDM cosmology. Finally, the model does not exhibit early dark energy features, and thus it immediately passes BBN constraints, while the variation of the effective Newton’s constant lies well inside the observational bounds.
F. Anagnostopoulos, S. Basilakos and E. Saridakis
Mon, 3 May 21
34/45
Comments: 4 pages, 2 figures, 2 Tables
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