On the cosmological consequences of a time dependent lambda term

Nov, 1991
13 pages
Published in:
  • Phys.Rev.D 46 (1992) 2404-2407
Report number:
  • IF-UFRJ-91-36

Citations per year

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Abstract: (APS)
The phenomenological approach to investigate the decay of the effective cosmological constant, as recently proposed by Chen and Wu, is generalized to include a term proportional to H2 on the time dependence of Λ, where H is the Hubble parameter. This new term can modify some features of the standard Friedmann-Robertson-Walker model and its free parameter may be adjusted in accordance with nucleosynthesis constraints. The model also allows a deceleration parameter q0 assuming negative values so that the density parameter Ω0 is smaller than ⅔ and the age of the Universe is always bigger than H0−1. In these cases, the usual matter creation rate appearing in models with a decaying vacuum energy is smaller than the one present in the steady-state model.
  • cosmological constant
  • fundamental constant: time dependence
  • field equations
  • numerical calculations: interpretation of experiments