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| Main Authors: | , , , |
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| Format: | Preprint |
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2022
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2207.05076 |
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| _version_ | 1866929330583502848 |
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| author | Shaily Singh, J. K. Santos, Joao R. L. Zeyauddin, M. |
| author_facet | Shaily Singh, J. K. Santos, Joao R. L. Zeyauddin, M. |
| contents | We study an isotropic flat FLRW-model in Scale-covariant theory of gravity $ f_{γδ}(ϕ) $ \cite{Canuto:1977zz} which is explained in terms of ordinary and covariant differentiation of scalar field $ ϕ$. As we know the deceleration parameter is time-dependent, so we consider the deceleration parameter $ q $ as the function of $ t $. Using this methodology, we find all the important cosmological factors in terms of a hyperbolic function of the cosmic time $ t $. In turn, we create the model having the behavior of the late-time universe, which is ever accelerated expanding and faces a Big Freeze at the end. The model shows the quintessence dark energy model from early to late times. We compute the constrained values of Hubble parameter $ H_0=70.979^{+0.021}_{-0.0043} $ and the model parameter $ n=1.24079^{+0.00015}_{-0.00079} $ using joint analysis of the $ OHD $ data of 77-points and Pantheon bin data. The model exhibits point-type singularity, beginning with a point of zero volume, infinite energy density, and temperature. Furthermore, we obtain the present deceleration parameter $ (q_0) \approx {-0.54} $. Also, we examine the ultimate behavior of our model by properly analyzing energy conditions, cosmographical parameters, and Statefinder diagnostic. Finally, the proposed model behaves like a quintessence dark energy model. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2207_05076 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Dynamical analysis of a hyperbolic solution in Scale-covariant theory Shaily Singh, J. K. Santos, Joao R. L. Zeyauddin, M. General Relativity and Quantum Cosmology We study an isotropic flat FLRW-model in Scale-covariant theory of gravity $ f_{γδ}(ϕ) $ \cite{Canuto:1977zz} which is explained in terms of ordinary and covariant differentiation of scalar field $ ϕ$. As we know the deceleration parameter is time-dependent, so we consider the deceleration parameter $ q $ as the function of $ t $. Using this methodology, we find all the important cosmological factors in terms of a hyperbolic function of the cosmic time $ t $. In turn, we create the model having the behavior of the late-time universe, which is ever accelerated expanding and faces a Big Freeze at the end. The model shows the quintessence dark energy model from early to late times. We compute the constrained values of Hubble parameter $ H_0=70.979^{+0.021}_{-0.0043} $ and the model parameter $ n=1.24079^{+0.00015}_{-0.00079} $ using joint analysis of the $ OHD $ data of 77-points and Pantheon bin data. The model exhibits point-type singularity, beginning with a point of zero volume, infinite energy density, and temperature. Furthermore, we obtain the present deceleration parameter $ (q_0) \approx {-0.54} $. Also, we examine the ultimate behavior of our model by properly analyzing energy conditions, cosmographical parameters, and Statefinder diagnostic. Finally, the proposed model behaves like a quintessence dark energy model. |
| title | Dynamical analysis of a hyperbolic solution in Scale-covariant theory |
| topic | General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2207.05076 |