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Dynamical reconstruction of the Formula omittedCDM model in the scalar-tensor representation of Formula omitted gravity
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Dynamical reconstruction of the Formula omittedCDM model in the scalar-tensor representation of Formula omitted gravity
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Journal Article
Dynamical reconstruction of the Formula omittedCDM model in the scalar-tensor representation of Formula omitted gravity
2025
Overview
Motivated by the growing interest in the nonmetricity-matter couplings, we develop the scalar-tensor formulation of recently introduced f(Q, T) gravity, where Q is the nonmetricity and T is the trace of the energy-momentum tensor. The main properties of the scalar-tensor formalism for the Friedmann-Lemaître-Robertson-Walker (FLRW) Universe are discussed, and we introduce an appropriate set of dynamical variables to analyze the cosmic evolution of the scalar-tensor f(Q, T) cosmology as a dynamical system. By considering two distinct cosmic fluids, namely matter and radiation, we have demonstrated that the cosmological phase space exhibits the typical curvature-dominated, radiation-dominated, matter-dominated, and exponentially accelerated fixed points. Furthermore, under an appropriate set of initial conditions compatible with the current observations from the Planck satellite, our analysis shows that the scalar-tensor f(Q, T) successfully yields models indistinguishable from the [Formula omitted]CDM cosmology and compatible with the weak-field solar system dynamics, without the inclusion of a cosmological constant [Formula omitted]. Thus, the theory introduced herein may be regarded as a suitable candidate to describe the cosmological dynamics of the Universe.
