New parametrization of the dark-energy equation of state with a single parameter
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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866914818042101760 |
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| author | Singh, J. K. Singh, Preeti Saridakis, Emmanuel N. Myrzakul, Shynaray Balhara, Harshna |
| author_facet | Singh, J. K. Singh, Preeti Saridakis, Emmanuel N. Myrzakul, Shynaray Balhara, Harshna |
| contents | We propose a novel dark-energy equation-of-state parametrization, with a single parameter $η$ that quantifies the deviation from $Λ$CDM cosmology. We first confront the scenario with various datasets, from 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 $Λ$CDM cosmology is favored, although the zero value is marginally inside the 1$σ$ confidence level. However, we find that the present Hubble function value acquires a higher value, namely $ H_0= 66.624^{+0.011}_{-0.013}~Km~ s^{-1} Mpc^{-1} $, which implies that the $H_0$ 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 $ Λ$CDM paradigm at high redshifts, while the deviation becomes significant at late and recent times and especially in the future. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_03783 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | New parametrization of the dark-energy equation of state with a single parameter Singh, J. K. Singh, Preeti Saridakis, Emmanuel N. Myrzakul, Shynaray Balhara, Harshna General Relativity and Quantum Cosmology We propose a novel dark-energy equation-of-state parametrization, with a single parameter $η$ that quantifies the deviation from $Λ$CDM cosmology. We first confront the scenario with various datasets, from 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 $Λ$CDM cosmology is favored, although the zero value is marginally inside the 1$σ$ confidence level. However, we find that the present Hubble function value acquires a higher value, namely $ H_0= 66.624^{+0.011}_{-0.013}~Km~ s^{-1} Mpc^{-1} $, which implies that the $H_0$ 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 $ Λ$CDM paradigm at high redshifts, while the deviation becomes significant at late and recent times and especially in the future. |
| title | New parametrization of the dark-energy equation of state with a single parameter |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2304.03783 |