The value of the cosmological constant

  title={The value of the cosmological constant},
  author={John D. Barrow and Douglas J. Shaw},
  journal={General Relativity and Gravitation},
  • J. Barrow, D. Shaw
  • Published 16 May 2011
  • Physics
  • General Relativity and Gravitation
We make the cosmological constant, Λ, into a field and restrict the variations of the action with respect to it by causality. This creates an additional Einstein constraint equation. It restricts the solutions of the standard Einstein equations and is the requirement that the cosmological wave function possess a classical limit. When applied to the Friedmann metric it requires that the cosmological constant measured today, tU, be $${\Lambda \sim t_{U}^{-2} \sim 10^{-122}}$$ , as observed. This… 
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