An f(Q) gravity function is derived by forcing its dark energy density to match New Agegraphic Dark Energy, and this NADE-equal-f(Q) model fits BAO data only marginally better than the standard model.
Interacting holographic dark energy in Brans-Dicke theory
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abstract
We study cosmological application of interacting holographic energy density in the framework of Brans-Dicke cosmology. We obtain the equation of state and the deceleration parameter of the holographic dark energy in a non-flat universe. As system's IR cutoff we choose the radius of the event horizon measured on the sphere of the horizon, defined as $L=ar(t)$. We find that the combination of Brans-Dicke field and holographic dark energy can accommodate $w_D = -1 $ crossing for the equation of state of \textit{noninteracting} holographic dark energy. When an interaction between dark energy and dark matter is taken into account, the transition of $w_D$ to phantom regime can be more easily accounted for than when resort to the Einstein field equations is made.
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astro-ph.CO 1years
2025 1verdicts
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New Agegraphic Dark Energy Driven Reconstruction of \boldmath{$f(Q)$} Gravity and its Cosmological Implications
An f(Q) gravity function is derived by forcing its dark energy density to match New Agegraphic Dark Energy, and this NADE-equal-f(Q) model fits BAO data only marginally better than the standard model.