BBN Constraints on $f(Q,T)$ Gravity

Abstract

$f(Q,T)$ gravity is a novel extension of the symmetric teleparallel gravity where the Lagrangian $L$ is represented through an arbitrary function of the nonmetricity $Q$ and the trace of the energy-momentum tensor $T$ \cite{fqt}. In this work, we have constrained a widely used $f(Q,T)$ gravity model of the form $f(Q,T)=Q^{n+1}+mT$ from the primordial abundances of the light elements to understand its viability in Cosmology. We report that the $f(Q,T)$ gravity model can elegantly explain the observed abundances of Helium and Deuterium while the Lithium problem persists. From the constraint on the expansion factor in the range $0.9425\lesssim Z\lesssim 1.1525$, we report strict constraints on the parameters $m$ and $n$ in the range $-1.13\lesssim n\lesssim -1.08$ and $-5.86\lesssim m\lesssim 12.52$ respectively.

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Cited by in corpus (3)

• New models and Big Bang Nucleosynthesis constraints in $f(Q)$ gravity
• Cosmological Perturbation Theory in $f(Q,T)$ Gravity
• Metric-affine Myrzakulov gravity theories with Gauss-Bonnet and boundary term scalars