Statistics – Computation
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...404....1o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 404, no. 1, p. 1-7.
Statistics
Computation
33
Cosmology, Decay, Microwaves, Relic Radiation, Vacuum, Computational Astrophysics, Cosmic Background Explorer Satellite, Dark Matter, Radiant Flux Density
Scientific paper
We consider the possible decay of a vacuum with nonzero energy density into radiation. This is one way to introduce a time-varying cosmological constant, which has been suggested as a means of resolving the cosmological constant problem. We concentrate on the model of Freese et al., in which the vacuum energy density is given as a fraction x/(1 - x) of the energy density of radiation. Using equations for the visible extragalactic background light and assuming that the vacuum decay energy is converted entirely into photons with a Planckian spectrum, we show that the decay process would be capable of contributing significantly to the intensity of the cosmic microwave background. Comparison with COBE observations leads to the constraint x is equal to or less than 0.001, which is stronger than the upper limit of 0.07 obtained previously by Freese et al. from considerations of primordial nucleosynthesis.
Bowyer Stuart
Overduin James M.
Wesson Paul S.
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