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- Title
Dynamical analysis of a hyperbolic solution in scale-covariant theory.
- Authors
Shaily; Singh, J. K.; Santos, Joao R. L.; Zeyauddin, M.
- Abstract
In this paper, we study an isotropic flat FLRW-model in scale-covariant theory of gravity f γ δ (ϕ) 1 which is explained in terms of ordinary and covariant differentiation of scalar field ϕ. As we know, the deceleration parameter (DP) is time-dependent, so we consider the DP 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 = 7 0. 9 7 9 − 0. 0 0 4 3 + 0. 0 2 1 and the model parameter n = 1. 2 4 0 7 9 − 0. 0 0 0 7 9 + 0. 0 0 0 1 5 using joint analysis of the OHD data of 77-points and Pantheon bin data. The model exhibits point-type singularity as it begins with a point of zero volume, infinite energy density and temperature. Furthermore, we obtain the present value of DP (q 0) ≈ − 0. 5 4. Also, we examine the ultimate behavior of our model by the proper analysis of energy conditions (ECs), cosmographical parameters and Statefinder diagnostic. Finally, the proposed model behaves like a quintessence dark energy model.
- Subjects
HUBBLE constant; DARK energy; SCALAR field theory; HYPERBOLIC functions; DATA binning; ENERGY density
- Publication
International Journal of Modern Physics D: Gravitation, Astrophysics & Cosmology, 2024, Vol 33, Issue 5/6, p1
- ISSN
0218-2718
- Publication type
Article
- DOI
10.1142/S021827182450024X