Bulk Viscous Fluid Bianchi Type-I String Cosmological Model With Negative Constant Deceleration Parameter

Singh, Kangujam Priyokumar; Baro, Jiten

doi:10.37418/amsj.9.7.55

Cited by 7 publications

(7 citation statements)

References 7 publications

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“…Bhoyar et al [32] analyzed Kantowaski-Sachs cosmological model with mass gooey and grandiose string in the structure of Teleparallel Gravity supposed ) (T f gravity, where T denotes the torsion scalar. Singh and Baro [33] researched Bianchi Type-I string cosmological model with mass thick liquid and negative consistent deceleration boundary in everyday relativity.…”

Section: Dynamics Of Bulk Viscous String Cosmologicalmentioning

confidence: 99%

Dynamics of Bulk Viscous String Cosmological Model in f(R,G) Theory of Gravity

Borgade

Bhoyar²,

Basotia³

2021

IJRESM

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Existing investigations dedicated to the self-propelling investigation of dynamics of bulk viscous string in LRS Bianchi type-I cosmological model within the circumstance of alternative theory of gravity with Langrangian be the impulsive perform of Ricci scalar R and Gouss-Bonnet invariant G , say f(R,G) gravity. Exact solutions of the field equations correspond to special law of variation which provides singular model. Also some physical and kinematical aspects and its behavior with the present day universe of the cosmological model have been discussed.

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Section: Dynamics Of Bulk Viscous String Cosmologicalmentioning

confidence: 99%

Dynamics of Bulk Viscous String Cosmological Model in f(R,G) Theory of Gravity

Borgade

Bhoyar²,

Basotia³

2021

IJRESM

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“…In the existence of viscosity, some cosmological models in different theories of relativity were studied. Bianchi type 𝐼 string cosmological model with negative constant deceleration parameter and bulk viscous fluid in the general relativity theory studied by Singh and Baro [17]. Bianchi type 𝑉𝐼 0 holographic Ricci dark energy model in the Brans-Dicke theory [18] was studied by Santhi et al [19].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Functions of the Universe in the Presence of Viscosity in the Relativity Theory and Lyra Geometry

Hegazy

Abdel-Megied

Gedamy

2023

Sohag Journal of Sciences

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This paper investigates the thermodynamic functions of the universe in the presence of viscous fluid in general relativity and Lyra geometry. The space-time is modeled by Bianchi type 𝑉𝐼 0 cosmological model. The field equations' solution is obtained considering that the scalar expansion θ of the cosmological model is proportional to the eigenvalue 𝜎 1 1 of the shear tensor 𝜎 𝑖 𝑗 . The thermodynamic functions are studied for the universe and their values are compared in general relativity and Lyra geometry. For all obtained models, the entropy is consistent with the second law of thermodynamics. The physical and geometrical properties of the obtained models are discussed. Also, we show that the Lyra term 𝛽 plays the role of the variable cosmological term in the relativity theory and can not be identified as a viscosity term. Without the viscosity term, we obtain the entropy as a constant 𝑺= constant. That is the universe is in an adiabatic state. The Bianchi type 𝑉𝐼 0 cosmological model presented in this paper explains a stage of evolution with the positive deceleration parameter.

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“…Mohanty and Samanta (2009) have investigated a five dimensional axially symmetry string cosmological models in general theory of relativity in presence of bulk viscous fluid. 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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Bulk Viscous Fluid Bianchi Type-I String Cosmological Model With Negative Constant Deceleration Parameter

Cited by 7 publications

References 7 publications

Dynamics of Bulk Viscous String Cosmological Model in f(R,G) Theory of Gravity

Dynamics of Bulk Viscous String Cosmological Model in f(R,G) Theory of Gravity

Thermodynamic Functions of the Universe in the Presence of Viscosity in the Relativity Theory and Lyra Geometry

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

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