Large-scale baryon isocurvature inhomogeneities

Craig J. Copi, Keith A. Olive, David N. Schramm

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


Big bang nucleosynthesis constraints on baryon isocurvature perturbations are determined. A simple model ignoring the effects of the scale of the perturbations is first reviewed. This model is then extended to address the claim that large amplitude perturbations will collapse, preventing their baryons from contributing to the observed baryon density. It is found that baryon isocurvature perturbations are constrained to provide only a slight increase in the density of baryons in the universe over the standard homogeneous model. In particular, it is found that models which rely on power laws and the random phase approximation for the power spectrum are incompatible with big bang nucleosynthesis unless an ad hoc, small-scale cutoff is included.

Original languageEnglish (US)
Pages (from-to)51-59
Number of pages9
JournalAstrophysical Journal
Issue number1
StatePublished - Sep 20 1995


  • Cosmology: theory
  • Elementary particles
  • Nuclear reactions, nucleosynthesis, abundances


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