Cited by 246Cosmology and Gravitation TheoriesNuclear physics research studiesParticle physics theoretical and experimental studies

Cosmological baryon diffusion and nucleosynthesis

Applegate, James H., Hogan, Craig J., Scherrer, Robert J.·1987·Physical Review D

Abstract

The diffusion rate of baryons through the big-bang plasma is calculated. Fluctuations in baryon density in the early Universe lead to inhomogeneities in the neutron-proton ratio, due to the differential diffusion of these particles through the radiation plasma. For certain types of nonlinear fluctuations, some nucleosynthesis would occur in very neutron-rich regions. Nuclear products of homogeneous neutron-enriched regions are evaluated numerically using a standard reaction network and these results are used to estimate final abundances in an inhomogeneous universe. Net deuterium and lithium abundances tend to increase and the net helium abundance tends to decrease compared to an unperturbed standard model. It is suggested that pronounced nonlinear baryon-density fluctuations produced in QCD- or electroweak-epoch phase transitions could alter abundances sufficiently to make a closed baryonic universe consistent with current observations of these elements. In such a model the abundance of heavier elements (C,N,O, etc.) increases significantly and approaches observable levels. Abundances can be used to place constraints on extreme scenarios for phase transitions at these epochs.

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Crossref · 10.1103/physrevd.35.1151

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  • If the QCD transition is strong enough, these clumps could be detected by gravitational femtolensing.

    “If the QCD transition is strong enough, these clumps could be detected by gravitational femtolensing [108].”

    From Phase Transitions in the Early and Present Universe (2006) · cites this paper as [108]

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Authors
Applegate, J. H., Hogan, C. J., & Scherrer, R. J.
Affiliations
  • Columbia University (US)
  • University of Arizona (US)
  • University of Chicago (US)
Venue
Physical Review D
Published
1987-02-15
Volume
35
Issue
4
Pages
1151-1160
ISSN
0556-2821 (ISSN-L)
OpenAlex
W2034982956
Cited by
246
References
24
Citations by year
2026: 6 · 2025: 1 · 2024: 2 · 2022: 3 · 2021: 3 · 2020: 2 · 2019: 5 · 2018: 3 · 2017: 4 · 2016: 2 · 2015: 1 · 2014: 1 · 2013: 2 · 2012: 1
FWCI
41.07
Type
journal article
Language
en
Open access
closed
Locations
  • Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Cosmology and Gravitation Theories
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Nuclear physics research studies
  • Physical Sciences › Physics and Astronomy › Nuclear and High Energy Physics › Particle physics theoretical and experimental studies
Keywords
big bang nucleosynthesis, baryon density fluctuations, neutron-to-proton ratio, deuterium abundance, lithium abundance, helium abundance, phase transitions, QCD phase transition, electroweak phase transition, closed universe, primordial abundances, reaction networks

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