Cosmic analysis of a model in higher-order gravity theory

Singh, J.K.; Shaily,; Balhara, Harshna; Bamba, Kazuharu; Jena, J.

doi:10.1016/j.ascom.2024.100790

Astronomy and Computing

2024

DOI: 10.1016/j.ascom.2024.100790

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Cosmic analysis of a model in higher-order gravity theory

J.K. Singh,

Shaily,

Harshna Balhara

et al.

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2024

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Cited by 2 publications

References 71 publications

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EDSFD parameterization in f(R,T) gravity with linear curvature terms

Singh,

Shaily,

Balhara

et al. 2024

Physics of the Dark Universe

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EDSFD parameterization in f(R,T) gravity with linear curvature terms

Singh,

Shaily,

Balhara

et al. 2024

Physics of the Dark Universe

View full text Add to dashboard Cite

New Parametrization of the Dark-Energy Equation of State with a Single Parameter

Singh,

Saridakis

et al. 2024

Universe

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We propose a novel dark-energy equation-of-state parametrization, with a single parameter η that quantifies the deviation from ΛCDM cosmology. We first confront the scenario with various datasets, from the Hubble function (OHD), Pantheon, baryon acoustic oscillations (BAO), and their joint observations, and we show that η has a preference for a non-zero value, namely, a deviation from ΛCDM cosmology is favored, although the zero value is marginally inside the 1σ confidence level. However, we find that the present Hubble function value acquires a higher value, namely, H0=66.624−0.013+0.011 Km s−1 Mpc−1, which implies that the H0 tension can be partially alleviated. Additionally, we perform a cosmographic analysis, showing that the universe transits from deceleration to acceleration in the recent cosmological past; nevertheless, in the future, it will not result in a de Sitter phase since it exhibits a second transition from acceleration to deceleration. Finally, we perform the statefinder analysis. The scenario behaves similarly to the ΛCDM paradigm at high redshifts, while the deviation becomes significant at late and recent times and especially in the future.

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Cosmic analysis of a model in higher-order gravity theory

Cited by 2 publications

References 71 publications

EDSFD parameterization in f(R,T) gravity with linear curvature terms

EDSFD parameterization in f(R,T) gravity with linear curvature terms

New Parametrization of the Dark-Energy Equation of State with a Single Parameter

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