Lyra’s cosmology of homogeneous and isotropic universe in Brans–Dicke theory

Prasad, Rajendra; Gupta, Lalit Kumar; Yadav, Anil Kumar

doi:10.1142/s0219887821500298

Cited by 6 publications

(3 citation statements)

References 65 publications

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“…Some other empirical values of q 0 in the vicinity of our obtained values of q 0 are given in Ref. [80,81,82,83,84,85]. Fig.…”

Section: Deceleration Parametersupporting

confidence: 52%

The simplest parametrization of equation of state parameter in the scalar field Universe

Shrivastava¹,

Khan²,

Goswami³

et al. 2021

Preprint

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In this paper, we have investigated a scalar field cosmological model of accelerating Universe with the simplest parametrization of equation of state parameter of the scalar field. We used H(z) data, pantheon compilation of SN Ia data and BAO data to constrained the model parameters using χ 2 minimization technique. We obtain the present values of Hubble constant H0 as 66.2 +1.42 −1.34 , 70.7 +0.32 −0.31 and 67.74 +1.24 −1.04 for H(z), H(z) + Pantheon and H(z) + BAO respectively. Also, we have estimated the present age of the Universe in derived model t0 = 14.38 +0.63 −0.64 for joint H(z) and pantheon compilation of SN Ia data which has only 0.88 σ tension with its empirical value obtained in Plank collaboration [1]. Moreover, the present values of the deceleration parameter q0 come out to be −0.55 +0.031 −0.038 , −0.61 +0.030 −0.021 and −0.627 +0.022 −0.025 by bounding the Universe in derived model with H(z), H(z) + Pantheon compilation of SN Ia and H(z) + BAO data sets respectively. We also have performed the state-finder diagnostics to discover the nature of dark energy.

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“…Some other empirical values of q 0 in the vicinity of our obtained values of q 0 are given in Ref. [80,81,82,83,84,85]. Fig.…”

Section: Deceleration Parametersupporting

confidence: 52%

The simplest parametrization of equation of state parameter in the scalar field Universe

Shrivastava¹,

Khan²,

Goswami³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

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“…However, it is worthwhile to note that ΛCDM model persists some theoretical problems [16][17][18], which incite researchers to search other options that can explain the data and have some theoretical appeal as well. We also observe that many cosmological models have been investigated by introducing dynamical dark energy with negative pressure [19][20][21][22][23][24]26] or modification in general theory of relativity [27][28][29][30][31][32][33][34][35][36][37], where additional gravitational degree(s) may lead the accelerated expansion of the Universe at present epoch (see [38,39]). In recent time, a discrepancy of H 0 value in measurement of Hubble parameter between Plank team and independent cosmological probes has been observed.…”

Section: Of 12mentioning

confidence: 96%

Redshift Drift in the Universe: Theoretical Features and Observational Constraints

Singla¹,

Gupta²,

Singh³

et al. 2023

Preprint

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In this paper, we investigate an exact Universe which is observational viable and filled with binary mixture of perfect fluid and cosmological constant $\Lambda$. Owning the non-uniform expansion of cosmos, we have considered redshift drift $\dot{z} = -(1+z)H_{0}+H(z)$ and performed statistical test to obtain the best fit value of model parameters of derived Universe with its observed values. Here $H_{0}$ and $z$ denote the present value of Hubble constant and redshift respectively. We estimate the best fit values of Hubble constant and density parameters are $H_{0} = 68.58 \pm 0.84$ km/s/Mpc, $(\Omega_{m})_{0} = 0.26 \pm 0.010$ and $(\Omega_{\Lambda})_{0} = 0.71 \pm 0.025$ by bounding the derived model with latest observational Hubble data (OHD) while with joint Pantheon data and OHD, its values are $H_{0} = 71.93 \pm 0.58$ km/s/Mpc, $(\Omega_{m})_{0} = 0.272 \pm 0.06$ and $(\Omega_{\Lambda})_{0} = 0.74 \pm 0.09$. The analysis of deceleration parameter and jerk parameter show that the Universe in derived model is compatible with $\Lambda$CDM model.

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“…Some other empirical values of q 0 in the vicinity of our obtained values of q 0 are given in Refs. [87][88][89][90][91][92].…”

Section: Deceleration Parametermentioning

confidence: 99%

The Simplest Parametrization of the Equation of State Parameter in the Scalar Field Universe

et al. 2023

Self Cite

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In this paper, we investigate a scalar field cosmological model of accelerating Universe with the simplest parametrization of the equation of state parameter of the scalar field. We use H(z) data, pantheon compilation of SN Ia data and BAO data to constrain the model parameters using the χ2 minimization technique. We obtain the present values of Hubble constant H0 as 66.2−1.34+1.42, 70.7−0.31+0.32 and 67.74−1.04+1.24 for H(z), H(z) + Pantheon and H(z) + BAO respectively. In addition, we estimate the present age of the Universe in a derived model t0=14.38−0.64+0.63 for joint H(z) and pantheon compilation of SN Ia data which has only 0.88σ tension with its empirical value obtained in Plank collaboration. Moreover, the present values of the deceleration parameter q0 come out to be −0.55−0.038+0.031, −0.61−0.021+0.030 and −0.627−0.025+0.022 by bounding the Universe in the derived model with H(z), H(z) + Pantheon compilation of SN Ia and H(z) + BAO data sets, respectively. We also have performed the state-finder diagnostics to discover the nature of dark energy.

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Lyra’s cosmology of homogeneous and isotropic universe in Brans–Dicke theory

Cited by 6 publications

References 65 publications

The simplest parametrization of equation of state parameter in the scalar field Universe

The simplest parametrization of equation of state parameter in the scalar field Universe

Redshift Drift in the Universe: Theoretical Features and Observational Constraints

The Simplest Parametrization of the Equation of State Parameter in the Scalar Field Universe

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