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• W2789232766 abstract "We reexamine big bang nucleosynthesis with large-scale baryon density inhomogeneities when the length scale of the density fluctuations exceeds the neutron diffusion length ($sim 10^7-10^8$ cm at BBN), and the amplitude of the fluctuations is sufficiently small to prevent gravitational collapse. In this limit, the final light element abundances can be determined by simply mixing the abundances from regions with different baryon/photon ratios without interactions. We examine gaussian, lognormal, and gamma distributions for the baryon/photon ratio, $eta $. We find that the deuterium and lithium-7 abundances increase with the RMS fluctuation in $eta $, while the effect on helium-4 is much smaller. We show that these increases in the deuterium and lithium-7 abundances are a consequence of Jensen's inequality, and we derive analytic approximations for these abundances in the limit of small RMS fluctuations. Observational upper limits on the primordial deuterium abundance constrain the RMS fluctuation in $eta $ to be less than $17%$ of the mean value of $eta $. This provides us with a new limit on the graininess of the early universe." @default.
• W2789232766 created "2018-03-29" @default.
• W2789232766 creator A5024570534 @default.
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• W2789232766 date "2018-08-28" @default.
• W2789232766 modified "2023-09-24" @default.
• W2789232766 title "Constraining density fluctuations with big bang nucleosynthesis in the era of precision cosmology" @default.
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• W2789232766 doi "https://doi.org/10.1103/physrevd.98.043534" @default.
• W2789232766 hasPublicationYear "2018" @default.
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