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Quintessence without scalar fields
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The issues of quintessence and cosmic acceleration can be discussed in the framework of theories which do not include necessarily scalar fields. It is possible to define pressure and energy density for new components considering effective theories derived from fundamental physics like the extended theories of gravity or simply generalizing the state equation of matter. Exact accelerated expanding solutions can be achieved in several schemes: either in models containing higher order curvature and torsion terms or in models where the state equation of matter is corrected by a second order Van der Waals terms. In this review, we present such new approaches and compare them with observations.
Forward citations
Cited by 8 Pith papers
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An Interplay Between Fractional Calculus and Holographic Dark Energy
Introduces Fractional Holographic Dark Energy (FHDE) via fractionally corrected entropy from a modified Wheeler-DeWitt equation and studies its late-time cosmology, field reconstructions, and extensions to modified gr...
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From minimal-length quantum theory to modified gravity
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Non-Singular Bouncing cosmology from Phantom Scalar-Gauss-Bonnet Coupling: Reconstruction with Observational Insights
Phantom scalar-Gauss-Bonnet coupling with bulk viscosity produces a stable non-singular bounce cosmology that fits Pantheon+ supernova data and places derived inflation observables inside Planck 68% CL contours.
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Cosmic Bulk Flow Analysis in Modified Gravity Theories: $f(R)$ and Perturbed $f(R)$ Models with Neutrino Coupling
Bulk flow speeds and directions are fitted to supernova data, and the neutrino-coupled f(R) model gives the largest fitted velocities, but the claim is a comparison of fit parameters rather than a prediction.
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The Kiselev black hole is neither perfect fluid, nor is it quintessence
The Kiselev black hole's stress-energy is anisotropic, so it is neither a perfect fluid nor standard quintessence, despite a large literature saying otherwise.
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Wormhole Modeling Supported by Non-Exotic Matter
Applies the f(R) = R - μ Rc (R/Rc)^p model and shape function b(r) = r log(r+1)/log(r0+1) to Morris-Thorne wormholes and analyzes energy conditions for non-exotic matter support.
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Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
Modified gravity theories supply viable mathematical frameworks for inflation, bounces, and dark energy eras that match observational data.
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