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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/039/04/0046

    • Keywords

       

      CMB; large scale structure; viscosity; neutrino mass.

    • Abstract

       

      In the recent past, measurements of $\sigma_8$ from large scale structure observations have shown some discordance with its value obtained from Planck CMB within the $\Lambda$CDM frame. This discordance naturally leads to a mismatch in the value of $H_0$ also. Under the presumption that these discordances are not due to systematics, several attempts have been made to ameliorate the tensions. In this article, we describe the methods of determination of σ8 from large scale as well as CMB observations.We discuss that these discrepancies vanish if we consider the energy momentum tensor for an imperfect fluid which could arise due to self-interaction of dark matter or in an effective description of large scale structure.We demonstrate how the presence of viscosities in cold dark fluid on large scales ameliorate the problem elegantly than other solutions. We also estimate the neutrino mass in the viscous cosmological setup.

    • Author Affiliations

       

      SUBHENDRA MOHANTY1 SAMPURN ANAND1 PRAKRUT CHAUBAL1 ARINDAM MAZUMDAR1 PRIYANK PARASHARI1 2

      1. Physical Research Laboratory, Navrangpura, Ahmedabad 380 009, India.
      2. Indian Institute of Technology Gandhinagar, Gandhinagar 382 355, India.

    • Dates

       
      Published
      30 August 2018
      Manuscript received
      8 June 2018
      Accepted
      23 July 2018
      Final version published online
      22 August 2018

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

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