Large Scale Baryon Isocurvature Inhomogeneities
arXiv:astro-ph/9410007 · doi:10.1086/176199
Abstract
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 test the claim that large amplitude perturbations will collapse, forming compact objects and 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 {\em ad hoc}, small scale cutoff is included.
11pages + 8figures, LaTeX (2.09), postscript figures available via anonymous ftp from oddjob.uchicago.edu:/ftp/ibbn/fig?.ps where ?=1-8 or via email from [email protected], Fermilab-Pub-94/???-A and UMN-TH-1307/94
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- Stochastic Isocurvature Baryon Fluctuations, Baryon Diffusion, and Primordial Nucleosynthesis
- Amplification of Isocurvature Perturbations induced by Active-Sterile Neutrino Oscillations
- Constraining Density Fluctuations with Big Bang Nucleosynthesis in the Era of Precision Cosmology
- On the primordial helium content: CMB and stellar constraints
- Does inhomogeneous big bang nucleosynthesis produce an inhomogeneous element distribution today?