Get access
Monthly Notices of the Royal Astronomical Society

Cosmology when living near the Great Attractor

Authors

  • Wessel Valkenburg,

    Corresponding author
    1. Instituut-Lorentz for Theoretical Physik, Universiteit Leiden, 2333 CA Leiden, The Netherlands
    2. Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120 Heidelberg, Germany
      E-mail: w.valkenburg@thphys.uni-heidelberg.de (WV); oeb@phys.au.dk (OEB)
    Search for more papers by this author
  • Ole Eggers Bjælde

    Corresponding author
    1. Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
      E-mail: w.valkenburg@thphys.uni-heidelberg.de (WV); oeb@phys.au.dk (OEB)
    Search for more papers by this author

E-mail: w.valkenburg@thphys.uni-heidelberg.de (WV); oeb@phys.au.dk (OEB)

ABSTRACT

If we live in the vicinity of the hypothesized Great Attractor, the age of the universe as inferred from the local expansion rate can be off by 3 per cent. We study the effect that living inside or near a massive overdensity has on cosmological parameters induced from observations of supernovae, the Hubble parameter and the cosmic microwave background. We compare the results to those for an observer in a perfectly homogeneous Λ cold dark matter universe. We find that for instance the inferred value for the global Hubble parameter changes by around three per cent if we happen to live inside a massive overdensity such as the hypothesized Great Attractor. Taking into account the effect of such structures on our perception of the universe makes cosmology perhaps less precise, but more accurate.

Get access to the full text of this article

Ancillary