Cosmology with decaying vacuum energy

Details Cosmology with decaying vacuum energy Cosmology with decaying vacuum energy

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987acs..meet.....f&link_type=abstract

Presented at the 194th American Chemical Society National Meeting, New Orleans, La., 30 Aug. 1987

Mathematics

Logic

Astronomical Models, Cosmology, Entropy, Expansion, Galactic Evolution, Vacuum, Flux Density, Gamma Rays, Microwaves, Nuclear Fusion

Scientific paper

Motivated by recent attempts to solve the cosmological constant problem, we examine the observational consequences of a vacuum energy density which decays in time. For all times later than t is approximately 1 sec, the ratio of the vacuum to the total energy density of the universe must be small. Although the vacuum cannot provide the missing mass required to close the universe today, its presence earlier in the history of the universe could have important consequences. We discuss restrictions on the vacuum energy arising from primordial nucleosynthesis, the microwave and gamma ray background spectra, and galaxy formation. A small vacuum component at the era of nucleosynthesis, 0.01 is less than rhovac/rhorad less than 0.1, and increases the number of allowed neutino species to Nnu greater than 5, but in some cases would severely distort the microwave spectrum.

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