Dirac's cosmology with varying cosmological constant

Details Dirac's cosmology with varying cosmological constant Dirac's cosmology with varying cosmological constant

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994gregr..26..909l&link_type=abstract

General Relativity and Gravitation, Volume 26, Issue 9, pp.909-916

Mathematics

Logic

37

Scientific paper

The phenomenological approach to investigating the decay of the vacuum energy density is generalized in the spirit of Dirac's large number hypothesis. Different arguments are outlined to justify an universal dependence of the type λ=ΒH 2 (Β is a pure number andH is the Hubble parameter). Such time-varying A does change the predictions of the earlier Dirac's cosmology. The deceleration parameter (q 0=(2-Β)/(1+Β)) and the age parameter (H 0t0=(1+Β)/3) are now compatible with the observations. The model also allows a “power-law” inflationary phase and a rate of matter creation smaller than the one present in the steady state universe.

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