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Generation of CMB and cosmological constant via bulk viscosity

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Abstract

A simple model of uniformly expanding, homogeneous Universe with a bulk viscosity is studied wherein the inflationary density decays due to viscous dissipation during the expansion phase of the Universe. The model is shown to generate the cosmic microwave background radiation. We also demonstrate that, at late times, the inflationary density asymptotically approaches a small finite constant value.

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Acknowledgements

SMC is grateful to the late Donald Lynden-bell for resurrecting his interest in the role of bulk viscosity in the context of cosmological models. The authors thank T. Padmanabhan for useful comments on an earlier version of the manuscript. SK thanks the Department of Science and Technology India for financial support under the Inspire Faculty grant. The ISRO-Respond grant partially supports the work of SS.

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Authors and Affiliations

  1. UM-DAE Centre for Excellence in Basic Sciences, Mumbai, 400 098, India

    Sanved Kolekar & S. M. Chitre

  2. Department of Physics, Indian Institute of Technology Bombay, Mumbai, 400076, India

    S. Shankaranarayanan

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  1. Sanved Kolekar
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  2. S. Shankaranarayanan
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  3. S. M. Chitre
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Correspondence to Sanved Kolekar.

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Kolekar, S., Shankaranarayanan, S. & Chitre, S.M. Generation of CMB and cosmological constant via bulk viscosity. Gen Relativ Gravit 52, 98 (2020). https://doi.org/10.1007/s10714-020-02749-0

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