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Anisotropic Viscous Fluid Cosmological Models from Deceleration to Acceleration in String Cosmology

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Abstract

In the present study, anisotropic locally rotationally symmetric (LRS) Bianchi type II models representing massive strings have been presented with variable mean deceleration parameter. The field equations in scalar-tensor theory with energy momentum tensor proposed by Letelier (Phys. Rev. D 28: 2414, 1983), have been solved for the bulk viscous fluid and perfect fluid under the following physically relevant assumptions: (a) scale factor varies with time as \(a(t) = (\sinh(\alpha t))^{\frac{1}{n}}\), (b) Expansion (θ) in the model is proportional to shear (σ), (c) p=γρ, where γ (0≤γ≤1) is a constant, (d) ξ(t)=ξ 0 ρ η. It has been observed that the presented universe has a phase transition from the early decelerating phase to the accelerating phase at present epoch which is in good agreement with the recent astronomical observations. Moreover, some physical and geometric properties of the models have been discussed in detail.

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Acknowledgements

The financial support as JRF (Sanction No. 09/797(0007)/2010-EMR-I) in part by CSIR, New Delhi, India is gratefully acknowledged by C. Chawla. The authors thank the anonymous referee whose valuable comments and suggestions have helped us to submit the revised version of this manuscript.

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Mishra, R.K., Pradhan, A. & Chawla, C. Anisotropic Viscous Fluid Cosmological Models from Deceleration to Acceleration in String Cosmology. Int J Theor Phys 52, 2546–2559 (2013). https://doi.org/10.1007/s10773-013-1540-4

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