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The European Physical Journal H

, Volume 43, Issue 1, pp 73–117 | Cite as

One hundred years of the cosmological constant: from “superfluous stunt” to dark energy

  • Cormac O’Raifeartaigh
  • Michael O’Keeffe
  • Werner Nahm
  • Simon Mitton
Article

Abstract

We present a centennial review of the history of the term known as the cosmological constant. First introduced to the general theory of relativity by Einstein in 1917 in order to describe a universe that was assumed to be static, the term fell from favour in the wake of the discovery of the expanding universe, only to make a dramatic return in recent times. We consider historical and philosophical aspects of the cosmological constant over four main epochs; (i) the use of the term in static cosmologies (both Newtonian and relativistic): (ii) the marginalization of the term following the discovery of cosmic expansion: (iii) the use of the term to address specific cosmic puzzles such as the timespan of expansion, the formation of galaxies and the redshifts of the quasars: (iv) the re-emergence of the term in today’s Λ-CDM cosmology. We find that the cosmological constant was never truly banished from theoretical models of the universe, but was marginalized by astronomers for reasons of convenience. We also find that the return of the term to the forefront of modern cosmology did not occur as an abrupt paradigm shift due to one particular set of observations, but as the result of a number of empirical advances such as the measurement of present cosmic expansion using the Hubble Space Telescope, the measurement of past expansion using type SN Ia supernovae as standard candles, and the measurement of perturbations in the cosmic microwave background by balloon and satellite. We give a brief overview of contemporary interpretations of the physics underlying the cosmic constant and conclude with a synopsis of the famous cosmological constant problem.

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Copyright information

© EDP Sciences and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Cormac O’Raifeartaigh
    • 1
  • Michael O’Keeffe
    • 1
  • Werner Nahm
    • 2
  • Simon Mitton
    • 3
  1. 1.School of Science and Computing, Waterford Institute of TechnologyWaterfordIreland
  2. 2.School of Theoretical Physics, Dublin Institute for Advanced StudiesDublin 2Ireland
  3. 3.St Edmund’s College, University of CambridgeCambridgeUK

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