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Geometric Perfect Fluids and Dark Side of the Universe by Gürses, Metin; Heydarzade, Yaghoub; Şentürk, Çetin is a scholarly article available to read on EtoBox.

What is Geometric Perfect Fluids and Dark Side of the Universe about?

Recently we showed that in FLRW cosmology, the contribution from higher curvature terms in any generic metric gravity theory to the energy-momentum tensor is of the perfect fluid form. Such a geometric perfect fluid can be interpreted as a fluid remaining from the beginning of the universe where the string theory is thought to be effective. Just a short time after the beginning of the Universe, it is known that the Einstein-Hilbert action is assumed to be modified by adding all possible curvature invariants. We propose that the observed late-time accelerating expansion of the Universe can be solely driven by this geometric fluid. To support our claim, we specifically study the quadratic gravity field equations in $D$-dimensions. We show that the field equations of this theory for the FLRW metric possess a geometric perfect fluid source containing two critical parameters $\sigma_1$ and $\sigma_2$. To analyze this theory concerning its parameter space $(\sigma_1, \sigma_2)$, we obtain the general second-order nonlinear differential equation governing the late-time dynamics of the deceleration parameter $q$. Hence using some present-day cosmological data as our initial conditions, our

Author

Gürses, Metin; Heydarzade, Yaghoub; Şentürk, Çetin

Published

2024

Language

EN