Observational Constraining Study of New Deceleration Parameters in FRW Universe

Bouali, Amine; Chaudhary, Himanshu; Mumtaz, Saadia; Mustafa, G.; Maurya, S. K.

doi:10.1002/prop.202300033

“…Observational analysis plays a critical role in determining the range of values for the deceleration parameter. For instance, the apparent brightness and redshift for supernovae in distant galaxies can be used to estimate the deceleration parameter [148][149][150][151][152][153][154][155][156][157][158]. Recent observations strongly support models that predict an accelerating universe.…”

Section: The Deceleration Parametermentioning

confidence: 99%

Cosmological tests of $$f(R,G,\mathcal {T})$$ dark energy model in FRW universe

Chaudhary,

Bouali,

Molla

et al. 2023

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The paper is devoted to study the observational signatures of $$f(R,G,\mathcal {T})$$ f ( R , G , T ) gravity in FRW universe. In this research article, we present a new cosmological model formulated within the $$f(R,G,\mathcal {T})$$ f ( R , G , T ) framework. To constrain the model parameters, we employ the Markov Chain Monte Carlo (MCMC) technique, which enables us to explore the parameter space effectively, and used the 36 points of cosmic chronometers and 1701 points from Pantheon Plus data. We compare our proposed $$f(R,G,\mathcal {T})$$ f ( R , G , T ) model with the widely accepted $$\Lambda $$ Λ CDM model, considering different cosmological parameters, including deceleration, snap, and jerk. By evaluating these parameters, we gain valuable insights into the dynamics and evolution of the universe within the context of our new model. Moreover, various diagnostic tests have been conducted, such as Statefinder and Om diagnostic, to further investigate the behavior and consistency of our $$f(R,G,\mathcal {T})$$ f ( R , G , T ) model. These tests offer deeper insights into the properties of our model and its compatibility with observational data. We subject our model to statistical analysis using Information Criteria, which serves as a rigorous quantitative assessment of the model’s goodness of fit to the data. This analysis aids in determining the level of agreement between our $$f(R,G,\mathcal {T})$$ f ( R , G , T ) model and the observational data, thus establishing the viability and reliability of our proposed cosmological framework. Our findings highlight the potential of the $$f(R,G,\mathcal {T})$$ f ( R , G , T ) framework in understanding the fundamental aspects of the universe’s evolution and dynamics. The comparative analysis with $$\Lambda $$ Λ CDM, as well as the comprehensive diagnostic tests performed, demonstrate the efficacy and validity of our model in explaining the observed cosmological phenomena. These results contribute to the ongoing pursuit of accurate and comprehensive models that can provide a deeper understanding of the nature of our universe.

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“…Studying the deceleration parameter is essential for understanding the evolution of the Universe and the influence of different components such as matter, radiation, or dark energy on its expansion dynamics. References such as [101][102][103][104][105] have employed the deceleration parameter to analyze and explain the evolutionary phases of the Universe in different cosmological models.…”

Section: Deceleration Parametermentioning

confidence: 99%

Constraints on the parameters of modified Chaplygin-Jacobi and modified Chaplygin-Abel gases in f(T) gravity

Chaudhary,

Debnath,

Roy

et al. 2023

Preprint

3

0

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In this work, we explore the parameter constraints of two dark energy models, namely the Modified Chaplygin-Jacobi gas (MCJG) and Modified Chaplygin-Abel gas (MCAG), within the context of $f(T)$ gravity model in a non-flat Friedmann-Lema\^itre-Robertson-Walker (FLRW) Universe. Our investigation involves comparing the equation of state for the MCJG and MCAG dark energy models with the equation of state derived from the $f(T)$ gravity model. To derive constraints for the dark energy and $f(T)$ gravity models, we use recent astronomical datasets, including $H(z)$ data, type Ia supernovae observations, Gamma Ray Bursts data, quasar data, and Baryon Acoustic Oscillation (BAO) measurements. We present the reduced Hubble parameter in terms of observable parameters such as $\Omega_{r0}$ (density parameter of radiation), $\Omega_{m0}$ (density parameter of dark matter), $\Omega_{k0}$ (density parameter associated with spatial curvature), $\Omega_{CJ0}$ (density parameter of Modified Chaplygin-Jacobi gas), $\Omega_{CA0}$ (density parameter of Modified Chaplygin-Abel gas), and $H_0$ (present value of the Hubble parameter). We explore the cosmological evolution through various cosmic diagnostic parameters, including the deceleration parameter, $Om(z)$ diagnostic, and statefinder diagnostic pair $\{r,s\}$. These diagnostic parameters offer valuable insights into the expansion dynamics and the nature of dark energy in the Universe. We have also assessed the viability of the models using the information criteria. Our aim is to shed light on the nature of dark energy and its connection to the $f(T)$ gravity model, and ultimately gain a deeper understanding of the underlying mechanisms driving the accelerated expansion of our Universe.

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“…Recently, several theoretical models have been developed to analyze the entire evolutionary history of the Universe through parameterization of q(z) as a function of scale factor (a(t)) or time (t) or redshift (z) in the reference. [36][37][38][39][40][41][42][43][44] The following is how this document is organized. In the introduction part, models in modern cosmology are discussed.…”

Section: Introductionmentioning

confidence: 99%

Model‐Independent Study for a Quintessence Model of Dark Energy: Analysis and Observational Constraints

Bouali,

Chaudhary,

Mehrotra

et al. 2023

Fortschritte der Physik

Self Cite

10

0

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In this paper, a well‐motivated parameterization of the Hubble parameter (H) is revisited that renders two models of dark energy showing some intriguing features of the late‐time accelerating Universe. A general quintessence field is considered as a source of dark energy. Tighter constraints using recently updated cosmic observational datasets for the considered models have been obtained. The two models described here show a nice fit to the considered uncorrelated Hubble datasets, Standard candles, Gamma Ray Bursts, Quasars, and uncorrelated Baryonic Acoustic Oscillations datasets. Using the constrained values of the model parameters, some features of the late‐time accelerating models and obtained the present value of the deceleration parameter (q0), the present value of the Hubble parameter (H0) and the transition redshift () from deceleration to acceleration have been discussed. The current value of the deceleration parameter for both models is consistent with the Planck 2018 results. The evolution of the geometrical and physical parameters is discussed through graphical representations for both models with some diagnostic analysis. The statistical analysis performed here shows greater results and overall, the outcomes of this investigation are superior to those previously found.

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Observational Constraining Study of New Deceleration Parameters in FRW Universe

Cited by 19 publications

References 82 publications

Cosmological tests of $$f(R,G,\mathcal {T})$$ dark energy model in FRW universe

Cosmological tests of $$f(R,G,\mathcal {T})$$ dark energy model in FRW universe

Constraints on the parameters of modified Chaplygin-Jacobi and modified Chaplygin-Abel gases in f(T) gravity

Model‐Independent Study for a Quintessence Model of Dark Energy: Analysis and Observational Constraints

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