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A New cosmological constant model

Jan, 1995
7 pages
Published in:
  • Mod.Phys.Lett.A 11 (1996) 1-7
e-Print:
DOI:
Report number:
  • CERN-TH-95-6,
  • CERN-TH-95-06,
  • CERN-TH-95-006,
  • CTP-TAMU-69-94,
  • ACT-25-94
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Abstract: (arXiv)
We propose a new cosmological model with a time-dependent cosmological constant (Λ∝1/t2\Lambda\propto 1/t^2), which starting at the Planck time as ΛPl∼MPl2\Lambda_{Pl}\sim M^2_{Pl}, evolves to the present-day allowed value of Λ0∼10−120MPl2\Lambda_0\sim10^{-120}M^2_{Pl}. This scenario is supported by non-critical string theory considerations. We compute the age of the Universe and the time-dependence of the scale factor in this model, and find general agreement with recent determinations of the Hubble parameter for substantial values of ΩΛ\Omega_{\rm \Lambda}. This effectively low-density open Universe model differs from the traditional cosmological constant model, and has observable implications for particle physics and cosmology.
Note:
  • 7 pages, LaTeX, 2 figures (included).
  • cosmological model
  • cosmological constant
  • fundamental constant: time dependence
  • matter: density
  • numerical calculations