Kaluza-Klein FRW type Perfect Fluid Cosmological Models with Linearly varying Deceleration Parameter in a Modified Gravity

Reddy, Dandala Rk; Aditya, Y.

doi:10.18689/ijpsr-1000105

Cited by 2 publications

(3 citation statements)

References 35 publications

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“…For the present study, we have used the following values of cosmological parameters. to those obtained from some other recent studies [12,13,[24][25][26][27][28].…”

Section: The Continuity Equation For the Cosmic Constituents Issupporting

confidence: 76%

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Time Dependence of Various Cosmological Parameters in the Framework of Kaluza-Klein Space-Time

Roy

Sarkar

Ghosh

2019

IJSRST

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A theoretical model, regarding the time dependence of several cosmological parameters, has been constructed in the present study, in the framework of Kaluza-Klein theory, using its field equations for a spatially flat metric. Time dependent empirical expressions of the cosmological constant and the equation of state (EoS) parameter have been substituted into the field equations to determine the time dependence of various cosmological parameters. Time variations of these parameters have been shown graphically. The cosmological features obtained from this model are found to be in agreement with the observed characteristics of the accelerating universe. Interestingly, the signature flipping of the deceleration parameter, from positive to negative, is predicted by this model, indicating a transformation of the universe from a state of decelerated expansion to accelerated expansion, as obtained from astrophysical observations. Time dependence of the gravitational constant (G), energy density (?), cosmological constant (?) and the EoS parameter (?) have been determined and depicted graphically in the present study.

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“…For the present study, we have used the following values of cosmological parameters. to those obtained from some other recent studies [12,13,[24][25][26][27][28].…”

Section: The Continuity Equation For the Cosmic Constituents Issupporting

confidence: 76%

“…Here we have used the relation = + . Equation(25) determines the time dependence of the gravitational constant. Let 0 denote the present value of the gravitational constant.…”

mentioning

confidence: 99%

Time Dependence of Various Cosmological Parameters in the Framework of Kaluza-Klein Space-Time

Roy

Sarkar

Ghosh

2019

IJSRST

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“…Mention may be made of f (R) gravity, scalar tensor theories, Galilean gravity, Gauss-Bonnet gravity, braneworld models and so on [10,[24][25][26][27][28][29][30][31][32][33]. Higher dimensional Kaluza-Klein space-time with perfect fluid source was studied in [34,35], and the dark energy model with variable deceleration parameter with the same metric was investigated in the scale covariant theory of gravitation [36]. The spatially homogeneous Bianchi type dark energy models were discussed with different equations of state by some authors in this theory [37,38].…”

Section: Introductionmentioning

confidence: 99%

Dark energy and modified scale covariant theory of gravitation

Singh

Mandal

Devi³

et al. 2020

New Astronomy

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Taking up four model universes we study the behaviour and contribution of dark energy to the accelerated expansion of the universe, in the modified scale covariant theory of gravitation. Here, it is seen that though this modified theory may be a cause of the accelerated expansion it cannot totally outcast the contribution of dark energy in causing the accelerated expansion. In one case the dark energy is found to be the sole cause of the accelerated expansion. The dark energy contained in these models come out to be of the ΛCDM type and quintessence type comparable to the modern observations. Some of the models originated with a big bang, the dark energy being prevalent inside the universe before the evolution of this era. One of the models predicts big rip singularity, though at a very distant future. It is interestingly found that the interaction between the dark energy and the other part of the universe containing different matters is enticed and enhanced by the gauge function φ(t) here.

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Kaluza-Klein FRW type Perfect Fluid Cosmological Models with Linearly varying Deceleration Parameter in a Modified Gravity

Cited by 2 publications

References 35 publications

Time Dependence of Various Cosmological Parameters in the Framework of Kaluza-Klein Space-Time

Time Dependence of Various Cosmological Parameters in the Framework of Kaluza-Klein Space-Time

Dark energy and modified scale covariant theory of gravitation

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