Particle creation and bulk viscosity in Bianchi-I universe in Saez–Ballester theory with different deceleration parameters

Chetia, Chayanika; Gohain, Mrinnoy M.; Bhuyan, Kalyan

doi:10.1007/s10714-023-03155-y

Cited by 3 publications

(1 citation statement)

References 80 publications

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“…Therefore, to address the problems with the observed discrepancies and limitations of the ΛCDM model, various generalized models have been proposed, including modified gravity models, such as MOND (Modified Newtonian Dynamics) [20,21], f (R) gravity [22][23][24][25], entropic gravity [26,27], bimetric gravity [28][29][30][31][32] minimally coupled Einstein scalar field system [33][34][35]; scalar-tensor theories [36][37][38][39], specifically, the Brans-Dicke theory [40][41][42], and their corresponding noncommutative extensions [43][44][45][46]; generalized Chaplygin gas models [47,48]; and establishing modified fundamental models from their corresponding standard ones in higher dimensions [49][50][51][52][53][54].…”

Section: Introductionmentioning

confidence: 99%

Fractional Scalar Field Cosmology

Rasouli,

Cheraghchi,

Moniz

2024

Fractal Fract

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Considering the Friedmann–Lemaître–Robertson–Walker (FLRW) metric and the Einstein scalar field system as an underlying gravitational model to construct fractional cosmological models has interesting implications in both classical and quantum regimes. Regarding the former, we just review the most fundamental approach to establishing an extended cosmological model. We demonstrate that employing new methodologies allows us to obtain exact solutions. Despite the corresponding standard models, we cannot use any arbitrary scalar potentials; instead, it is determined from solving three independent fractional field equations. This article concludes with an overview of a fractional quantum/semi-classical model that provides an inflationary scenario.

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Section: Introductionmentioning

confidence: 99%

Fractional Scalar Field Cosmology

Rasouli,

Cheraghchi,

Moniz

2024

Fractal Fract

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Studies on Bianchi type-III cosmological model with parametrization of deceleration parameter in a SBST theory

Singh,

Meitei

2024

Mod. Phys. Lett. A

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In this paper, we delve into the cosmological assessments concerning the deceleration parameter [Formula: see text] in the context of the Bianchi type-III cosmological model within the framework of the Saez–Ballester theory of gravitation. By postulating a proportional relationship between the shear scalar ([Formula: see text]) and the expansion scalar ([Formula: see text]), we derive solutions for the corresponding field equations. Additionally, we conduct an examination and evaluation of the model’s physical and kinematic parameters, including the jerk parameter and snap parameter, while also discussing the energy condition of the model. Through the depiction of graphical representations, we illustrate the variations of the cosmological parameters for specific sets of constants.

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Impact of particle creation in Rastall gravity

Bishi,

Lepse,

Beesham

2024

Int. J. Geom. Methods Mod. Phys.

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In this paper, we investigate the Friedmann–Lemaitre–Robertson–Walker cosmological models within the framework of Rastall gravity incorporating particle creation. The modified field equations for Rastall gravity are derived and exact solutions are obtained under various assumptions of the scale factor. The qualitative behavior of our solutions depends on the Rastall coupling parameter [Formula: see text]. Following Akarsu et al. [Ö. Akarsu et al., Rastall gravity extension of the standard [Formula: see text] CDM model: Theoretical features and observational constraints, Eur. Phys. J. C 80 (2020) 1050], we have restricted the Rastall coupling parameter [Formula: see text] to the range [Formula: see text] at 68% CL from CMB+BAO data. Further, we have discussed the distinct physical behavior of the derived models in detail.

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Particle creation and bulk viscosity in Bianchi-I universe in Saez–Ballester theory with different deceleration parameters

Cited by 3 publications

References 80 publications

Fractional Scalar Field Cosmology

Fractional Scalar Field Cosmology

Studies on Bianchi type-III cosmological model with parametrization of deceleration parameter in a SBST theory

Impact of particle creation in Rastall gravity

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