String cosmology with magnetized bulk viscous fluid in Bianchi I universe

Singh, C. P.

doi:10.1007/s10509-012-1236-x

Cited by 11 publications

(4 citation statements)

References 67 publications

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“…Singh and Mollah (Sing and Mollah, 2016) studied an LRS Bianchi type-I cosmological model with perfect fluidity in the framework of Lyra geometry in five dimensional space-time by using constant deceleration parameter. Kaiser (Kaiser and Stebbins, 1984), Banerjee (Banerjee et al, 1990), Wang (Wang, 2005), Bali et al (Bali et al, 2007), Power and Deshmukh (Pawar and Deshmukh, 2010), Sahoo and Mishra (Sahoo and Mishra, 2015), Singh (Singh, 2013), Goswami (Goswami et al, 2016), Reddy (Reddy and Naidu, 2007), Khadekar (Khadekar et al, 2005;Khadekar and Tade, 2007), Yadav (Yadav et al, 2011), Ladke (Ladke, 2014), Singh and Baro (Singh and Baro, 2020), Baro and Singh (Baro and Singh, 2020) are some of the authors who studied different string cosmological models within the general relativity in a different contexts in various space-times. In addition to the above mentioned authors, recently Choudhury (Choudhury, 2017), Tripathi (Tripathi et al, 2017), Dubey et al (Dubey et al, 2018), Tiwari et al (Tiwari et al, 2019), Ram et al (Ram and Verma, 2019), Mollah et al (Mollah et al, 2019), and Baro et al(Baro et al, 2021) investigated different string cosmological models in various space times.…”

Section: Introductionmentioning

confidence: 99%

Higher Dimensional Bianchi Type-I Cosmological Models With Massive String in General Relativity

Singh

Baro

Meitei³

2021

Front. Astron. Space Sci.

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Here we studied Bianchi type-I cosmological models with massive strings in general relativity in five dimensional space time. Out of the two different cases obtained here, one case leads to a five dimensional Bianchi type-I string cosmological model in general relativity while the other yields the vacuum Universe in general relativity in five dimensional space time. The physical and geometrical properties of the model Universe are studied and compared with the present day’s observational findings. It is observed that our model is anisotropic, expanding, shearing, and decelerates at an early stage and then accelerates at a later time. The model expands along x, y, and z axes and the extra dimension contracts and becomes unobservable at t → ∞. We also observed that the sum of the energy density (ρ) and the string tension density (λ) vanishes (ρ + λ = 0).

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Section: Introductionmentioning

confidence: 99%

Higher Dimensional Bianchi Type-I Cosmological Models With Massive String in General Relativity

Singh

Baro

Meitei³

2021

Front. Astron. Space Sci.

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“…A cosmological model in 5D spherically symmetric space-time with energy momentum tensors of minimally interacting fields of dark matter and holographic dark energy in Brans-Dicke theory was constructed by (29) . Authors in (30)(31)(32)(33)(34)(35)(36)(37) are the authors who studied different string cosmological models in general relativity in different context in various space-times.…”

Section: Introductionmentioning

confidence: 99%

Higher Dimensional LRS Bianchi Type-I String Cosmological Model with Bulk Viscosity in General Relativity

Priyokumar¹,

Baro²

2021

IJST

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Objective: To present a new solution to the field equations obtained for higher dimensional LRS Bianchi type-I universe generated by means of a cloud of strings with particles connected to them with bulk viscosity in general relativity. Methods: To obtain the solutions of field equations of higher dimensional LRS Bianchi type-I universe we consider that the shear scalar of the model is proportional to the scalar expansion of the model (σ αθ ), which leads to, c = b ∧ n. The physical and geometrical behaviors of the model universe are studied by comparing with the present cosmological scenario and observations. Findings: It is observed that our model is anisotropic, expanding and decelerates at early stage and then accelerates in late universe giving the inflation model universe. Novelty: We obtained new solution to the field equations for higher dimensional LRS Bianchi type-I generated by means of a cloud of strings with bulk viscous fluid in general relativity.

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“…Some authors [63,64] have investigated anisotropic models with magnetic field and bulk viscosity in string cosmology. Recently, Sharif and Waheed [65], and Singh [66] have studied Bianchi I magnetized viscous fluid model in string cosmology and have discussed the effect of viscous fluid and magnetic field on the classical potential. Therefore, the study of magnetized cosmic strings with bulk viscosity in richer structure of an anisotropic model like Bianchi V leads to a better understanding of the dynamics of the universe during early and late stages of the evolution.…”

Section: Introductionmentioning

confidence: 99%

Some exact solutions of magnetized viscous model in string cosmology

Singh

2014

Pramana - J Phys

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Abstract. In this paper, we study anisotropic Bianchi-V universe with magnetic field and bulk viscous fluid in string cosmology. Exact solutions of the field equations are obtained by using the equation of state for a cloud of strings, and a relationship between bulk viscous coefficient and scalar expansion. The bulk viscous coefficient is assumed to be inversely proportional to the expansion scalar. It is interesting to examine the effects of magnetized bulk viscous string model in early and late stages of the evolution of the universe. This paper presents the different string models like geometrical (Nambu string), Takabayashi (p-string) and Reddy string models by taking certain physical conditions. We discuss the nature of the classical potential for viscous fluid with and without magnetic field. We find that the introduction of bulk viscosity with and without magnetic field results in rapid change in density parameters and in the classical potential. The presence of bulk viscosity prevents the universe to be empty in its future evolution. The other physical and geometrical aspects of each string model are discussed in detail.

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String cosmology with magnetized bulk viscous fluid in Bianchi I universe

Cited by 11 publications

References 67 publications

Higher Dimensional Bianchi Type-I Cosmological Models With Massive String in General Relativity

Higher Dimensional Bianchi Type-I Cosmological Models With Massive String in General Relativity

Higher Dimensional LRS Bianchi Type-I String Cosmological Model with Bulk Viscosity in General Relativity

Some exact solutions of magnetized viscous model in string cosmology

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