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Observational constraints on emergent universe model with non-linear viscous fluid

Abstract

A flat emergent universe (EU) with a non-linear equation of state (\(p=A \rho +f(\rho )\)) is studied considering bulk viscosity. In the paper we obtain cosmological models with viscous fluid described by truncated Israel–Stewart theory. Using autonomous system of field equations the stability of the solutions are analyzed. The observational constraints on the model parameters are determined for different matter energy compositions of the universe with non-linear viscosity in the EU scenario.

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Acknowledgements

AC acknowledge the University of North Bengal for awarding Junior Research Fellowship. The authors would like to thank IUCAA Resource Center, NBU for providing research facilities. The authors acknowledge the constructive suggestions by the anonymous referee for the paper in its present form. BCP would like to thank SERB-DST for Project No. EMR/2016/005734.

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Paul, B.C., Chanda, A. Observational constraints on emergent universe model with non-linear viscous fluid. Gen Relativ Gravit 51, 71 (2019). https://doi.org/10.1007/s10714-019-2551-0

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Keywords

  • Emergent universe
  • Viscosity
  • Non-linear equation of state