An Axially Symmetric Transitioning models with Observational Constraints

Bhardwaj, Vinod Kumar; Rani, Rita; Goswami, G. K.; Pradhan, Anirudh

doi:10.48550/arxiv.2204.04451

Cited by 3 publications

(9 citation statements)

References 77 publications

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“…To observe the compatibility of models with the recent observational data, we will calculate the Hubble parameter H for each model in upcoming sections and compare the corresponding values of H with recent data. Bhardwaj et al [83] presented the observed values of H for 46 different points against redshift parameter z along with their observational error evaluated by using various age approach by different cosmologists presented in the Table 1 as…”

Section: Chi-square Testmentioning

confidence: 99%

“…4. The error bars added to the figure for comparison representing observations given in [83]. The estimated values for different parameters for minimum χ 2 have been computed as n = 1.096, M = 5, β = 0.6, γ = 1, ω = −1/3, DE0 = 0.7 and α is given in Eq.…”

Section: Modelmentioning

confidence: 99%

“…6. The error bars representing the recent observational data given in [83] are also added to the figure for comparison. The estimated values for different parameters for minimum χ 2 are computed as H 0 = 0.69, α = 10 −9 , M = 1.2, γ = 0.002, ω = −1/3, DE0 = 0.7 with five different values of n = 1.0358 (purple), 1.0362 (magenta), 1.0366 (green), 1.037 (orange), 1.0374 (black).…”

Section: Modelmentioning

confidence: 99%

“…10. The error bars representing observations given in [83] are also added to the figure for comparison. The estimated values for different parameters for minimum χ 2 have been computed as H (0) = 1, λ = 0.334, μ = 0.0001 and α = 0.001, ω = −1/3, DE0 = 0.7 and β is given in Eq.…”

Section: Modelmentioning

confidence: 99%

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Compatibility of big bang nucleosynthesis in some modified gravities

Sultan

Jawad

2022

Eur. Phys. J. C

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This paper is devoted to investigate the implications of Einstein-Aether and modified Hořava–Lifshitz theories of gravity to the formation of light elements in the early universe named as big bang nucleosynthesis. We choose different models from these theories for a detailed investigation of big bang nucleosynthesis epoch and compare it with the observational bounds. That is, we compare the deviation of freeze-out temperature $$T_{_f}$$ T f with the $$\Lambda $$ Λ CDM paradigm and use observational bounds on $$\left| \frac{\Delta T_{_f}}{T_{_f}}\right| $$ Δ T f T f to inspect constraints on the involved free parameters of these models. We apply Chi-square test on the Hubble parameter H in each model to analyze the compatibility of model parameters with the observations and find consistent results. We find that chosen models of Einstein-Aether gravity and modified Hořava–Lifshitz gravity can satisfy big bang nucleosynthesis constraints and thus constitute a viable cosmology since they can be source for dark energy sector and late-time accelerated expansion.

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Section: Chi-square Testmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

Section: Modelmentioning

confidence: 99%

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Compatibility of big bang nucleosynthesis in some modified gravities

Sultan

Jawad

2022

Eur. Phys. J. C

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“…Goswami et al [33] employed observational data from 38 H(z) and 581 SN Ia. We employed 46 observational Hubble data points in the red-shift region 0 ≤ z ≤ 2.36 in this work [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Corrected holographic dark energy with power-law entropy and Hubble Horizon cut-off in FRW Universe

Bhardwaj,

Garg,

Pradhan

et al. 2022

Preprint

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In the present work, we investigate the power-law entropy corrected holographic dark energy (PLECHDE) model with Hubble horizon cutoff. We use 46 observational Hubble data points in the redshift range 0 ≤ z ≤ 2.36 to determine the present Hubble constant H 0 and the model parameter n. It represents a phase transition of the universe from deceleration to acceleration and has the transition point at z t = 0.71165. We investigate the observational constraints on the model and calculate some relevant cosmological parameters. We examine the model's validity by drawing state-finder parameters that yield the result compatible with the modern observational data. The model's physical and geometrical characteristics are also explored, and they are shown to match well with current observations of observational Hubble data (OHD) and the latest joint light curves(JLA) datasets.

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A study of McVittie Spacetime in Stationary and Dynamical Regime

Bhattacharyya¹,

Ray

Khlopov

et al. 2022

Fortschritte der Physik

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One of the solutions of the Einstein equations, called McVittie solution, signifying a black hole embedded by the dynamic spacetime is studied. In the stationary spacetime the Mcvittie metric becomes the Schwarzschild-de Sitter metric (SdS). The geodesic of a freely falling test particle towards the black hole is examined in the SdS spacetime. It is found that unlike the Schwarzschild case the potential of such particle becomes maximum at a point where it eventually stops for a while and then resumes its motion towards the center of the black hole. It is shown that an observer or system of particles is spaghettified near the black hole singularity in the SdS spacetime. The dynamics of the universe in the framework of McVittie metric, being a generalized time dependent SdS solution, is represented in terms of that point, called stationary or turning point. The motion of the stationary point is studied in various regimes of the expanding universe and the possible outcomes are discussed in brief.

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An Axially Symmetric Transitioning models with Observational Constraints

Cited by 3 publications

References 77 publications

Compatibility of big bang nucleosynthesis in some modified gravities

Compatibility of big bang nucleosynthesis in some modified gravities

Corrected holographic dark energy with power-law entropy and Hubble Horizon cut-off in FRW Universe

A study of McVittie Spacetime in Stationary and Dynamical Regime

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