Fitting $f(Q,T)$ gravity models with a $Λ$CDM limit using H(z) and Pantheon data

Antonio Nájera; Amanda Fajardo

doi:10.1016/j.dark.2021.100889

paper

Fitting $f (Q, T)$ gravity models with a $Λ$ CDM limit using H(z) and Pantheon data

arXiv:2104.14065 · doi:10.1016/j.dark.2021.100889

Abstract

We proposed five $f (Q, T)$ models, which are an extension of symmetric teleparallel gravity, where $Q$ is the non-metricity and $T$ is the trace of the stress-energy tensor. By taking specific values of their parameters, these models have a $Λ$ CDM limit. Using cosmic chronometers and supernovae Ia data, we found that our models are consistent with $Λ$ CDM at a 95\% confidence level. To see whether one of these models can challenge $Λ$ CDM at a background perspective, we computed the Bayesian evidence for them and $Λ$ CDM. According to it, the concordance model is preferred over four of them, showing a weak preference against $f (Q, T) = - Q / G_{N} + b T$ and $f (Q, T) = - (Q + 2Λ) / G_{N} + b T$ , a substantial preference against $f (Q, T) = - (Q + 2 H_{0}^{2} c (Q / (6 H_{0}^{2}))^{n + 1}) / G_{N} + b T$ , and a strong preference against $f (Q, T) = - (Q + 2 H_{0}^{2} c (Q / (6 H_{0}^{2}))^{n + 1} + 2Λ) / G_{N} + b T$ . Interestingly, a model includying a $T^{2}$ dependence ( $f (Q, T) = - (Q + 2Λ) / G_{N} - ((16 π)^{2} G_{N} b) / (120 H_{0}^{2}) T^{2}$ ) showed a {substantial} preference against $Λ$ CDM. {Therefore, we encourage further analyses of this model to test its viability outside the background perspective.}

V3: Accepted version in Physics of the Dark Universe. Minor changes plus corrections in the results of the sixth model

Fitting $f (Q, T)$ gravity models with a $Λ$ CDM limit using H(z) and Pantheon data

Abstract

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Fitting f(Q,T) gravity models with a ΛCDM limit using H(z) and Pantheon data

Abstract

References in corpus (11)

Cited by in corpus (31)

Fitting $f (Q, T)$ gravity models with a $Λ$ CDM limit using H(z) and Pantheon data