Behaviour of viscous fluid in string cosmological models in the framework of Lyra geometry

Mollah, Mahbubur Rahman; Singh, Kangujam Priyokumar

doi:10.1016/j.newast.2021.101611

Cited by 11 publications

(3 citation statements)

References 90 publications

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“…Hatkar et al (11) , Mishra and Dua (12) , Santhi et al (13) , Bhoyar et al (14) , Hegazy (15) , Trivedi and Bhabor (16) , Dixit et al (17) and Mete and Deshmukh (18) . The behaviour of viscous fluid in the string cosmological model in the Lyra manifold, which takes into account the constant coefficient of bulk viscosity, has recently been explored by Mollah and Singh (19) .…”

Section: Introductionmentioning

confidence: 99%

String Viscous Fluid Cosmological Model in the Framework of Sen-Dunn Theory of Gravitation

Lambat,

Pund

2024

IJST

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Objective: To present a new solution to the field equations for higher-dimensional Bianchi type-III string viscous fluid cosmological model in the context of the Sen-Dunn theory of gravity. Methods: To obtain definite solution of the field equations, we consider a power law relation between the scale factor and scalar field, and we take into account two distinct scale factors, and , in which , are positive constants. This produces a time-dependent deceleration parameter. We analyse the model with constant bulk viscosity constant to explain the current accelerated expansion of the universe. Findings: Spatial volume of the model increases with cosmic time, which shows that universe is spatially expanding. Also, the model possesses a point-type singularity. It is noted that these models depict the universe's accelerated expansion. Novelty: We obtained new solution to the field equations for higher dimensional Bianchi type-III generated by means of a cloud of strings with bulk viscous fluid in Sen-Dunn theory by using quadratic form. Keywords: Bianchi type-III, Cosmic string, Bulk viscosity, Sen-Dunn Theory

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Section: Introductionmentioning

confidence: 99%

String Viscous Fluid Cosmological Model in the Framework of Sen-Dunn Theory of Gravitation

Lambat,

Pund

2024

IJST

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“…Aditya et al [21] studied the Bianchi type-IX model in the presence of anisotropic dark energy and a massive scalar meson field in Lyra geometry. Mollah et al [22] investigated the behavior of viscous fluid in string cosmological models within the framework of Lyra geometry. Reddy [23] static and non-static plane-symmetric string cosmological models are obtained in the Lyra manifold.…”

Section: Introductionmentioning

confidence: 99%

Stability of Axially Symmetric Cosmological Model in Lyra Geometry

Nimkar,

Wath

2023

J. Sci. Res.

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The present study concerns an examination of a cosmological model that exhibits axially symmetric and incorporates perfect fluid within the context of Lyra geometry. The field equations are solved by utilising the relation between the metric coefficients and the equation of state for a stiff fluid. The physical and kinematic properties, namely the Hubble parameter, the deceleration parameter, the energy density, and the pressure, have been examined, and their graphical behaviour has been analysed. Furthermore, we examined several additional parameters, including the redshift and the Om(z) diagnostic, and verified the stability of the model by utilising the sound speed ratio and perturbation technique.

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“…Samanta and Debata (2011) 2019) and Singh and Baro (2020) are some of the eminent authors who studied different string cosmological models in higher dimensional space time in the contexts of the general relativity. Recently Mollah and Singh (2021) and Baro et al (2021) constructed higher dimensional Bianchi type-III string cosmological in the framework of general relativity.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic cloud string cosmological model with five-dimensional kaluza-klein space-time

Ray

Baruah

2022

Front. Astron. Space Sci.

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Anisotropic cloud string cosmological models has been investigated in the context of five dimensional Kaluza- Klein space time. In this paper the energy momentum tensor is generated by rest energy density and tension density of the string with particle density attached to them. To obtained the exact solutions of the Einstein field equations we assumed a scale factor a(t)=e1β2βt+c where β and c are positive constant, which yields a variable deceleration parameter (DP) q=−aäȧ2=βH+α. The physical and geometrical behavior of the models is also discussed in detail.

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Behaviour of viscous fluid in string cosmological models in the framework of Lyra geometry

Cited by 11 publications

References 90 publications

String Viscous Fluid Cosmological Model in the Framework of Sen-Dunn Theory of Gravitation

String Viscous Fluid Cosmological Model in the Framework of Sen-Dunn Theory of Gravitation

Stability of Axially Symmetric Cosmological Model in Lyra Geometry

Anisotropic cloud string cosmological model with five-dimensional kaluza-klein space-time

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