Late-time cosmology with phantom dark-energy in $f(Q)$ gravity

Abstract

Motivated by the exciting features and a recent proposed general form of the function of non-metricity scalar Q, we investigate the cosmological implications in $f(Q)$ gravity, through the resulting effective dark energy sector, extracting analytical expressions for the dark energy density, equation-of-state parameter and the deceleration parameters. We show that even in the absence of a cosmological constant, the universe exhibits the usual thermal history, with the sequence of matter and dark energy eras, and the dark-energy equation-of-state parameter always lie in the phantom regime. Additionally, calculating the age of the universe, through the extracted analytical equations of the scenario at hand, we show that the result coincide with the value corresponding to $\Lambda$CDM scenario within 1$\sigma$. Moreover, we show the excellent agreement of the scenario at hand with Supernovae type Ia observational data. Lastly, comparing the cosmological behavior in the case of the absence of an explicit cosmological constant, with the one of the presence of a cosmological constant we show that $f(Q)$ gravity can mimic the cosmological constant in a very efficient way, providing very similar behavior, revealing the advantages and capabilitites of the scenario at hand.

18 pages, 5 figures

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• Non-exotic static spherically symmetric thin-shell wormhole solution in $f(Q,T)$ gravity
• Observational test for $f(Q)$ gravity with weak gravitational lensing
• How different connections in flat FLRW geometry impact energy conditions in $f(Q)$ theory?
• Dynamical system analysis of scalar field cosmology in coincident $f(Q)$ gravity
• Phase-space analysis of the viscous fluid cosmological models in the coincident $f(Q)$ gravity
• A model-independent method with phantom divide line crossing in Weyl-type $f(Q,T)$ gravity
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• Constraining Exponential f(Q) Gravity with Cosmic Chronometers and Supernovae: A Data-Driven Analysis
• Background-dependent and classical correspondences between $f(Q)$ and $f(T)$ gravity
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• Charged Gravastar Solutions in the Finch-Skea Framework with f(\mathbb{Q}) Gravity
• Is Dark Energy an Effective Manifestation of Non-equilibrium Thermodynamics? -- Insights from DESI