• The cosmological constant revisited

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      https://www.ias.ac.in/article/fulltext/pram/053/06/0937-0944

    • Keywords

       

      Cosmology; supernovae; cosmic microwave background; cosmological constant; vacuum fluctuations

    • Abstract

       

      I briefly review the observational evidence for a small cosmological constant at the present epoch. This evidence mainly comes from high redshift observations of Type 1a supernovae, which, when combined with CMB observations strongly support a flat Universe with Ωm + ΩA ⋍ 1. Theoretically a cosmological constant can arise from zero point vacuum fluctuations. In addition ultra-light scalar fields could also give rise to a Universe which is accelerating driven by a time dependent Λ-term induced by the scalar field potential. Finally a Λ dominated Universe also finds support from observations of galaxy clustering and the age of the Universe.

    • Author Affiliations

       

      Varun Sahni1

      1. Inter-University Centre for Astronomy and Astrophysics, Post Bag 4, Ganeshkhind, Pune - 411 007, India
    • Dates

       
  • Pramana – Journal of Physics | News

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