Helium photodisintegration and nucleosynthesis: Implications for topological defects, high-energy cosmic rays, and massive black holes - INSPIRE

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Helium photodisintegration and nucleosynthesis: Implications for topological defects, high-energy cosmic rays, and massive black holes

Mar, 1995

20 pages

Published in:

Phys.Rev.D 52 (1995) 6682-6693

e-Print:

astro-ph/9503094 [astro-ph]

DOI:

10.1103/PhysRevD.52.6682

Report number:

FERMILAB-PUB-95-051-A

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Abstract: (arXiv)

We consider the production of

^3

He and

^2

H by

^4

He photodisintegration initiated by non-thermal energy releases during early cosmic epochs. We find that this process cannot be the predominant source of primordial

^2

H since it would result in anomalously high

^3

He/D ratios in conflict with standard chemical evolution assumptions. We apply this fact to constrain topological defect models of highest energy cosmic ray (HECR) production. Such models have been proposed as possible sources of ultrahigh energy particles and gamma-rays with energies above

10^{20}

eV. The constraints on these models derived from

^4

He-photodisintegration are compared to corresponding limits from spectral distortions of the cosmic microwave background radiation (CMBR) and from the observed diffuse gamma-ray background. It is shown that for reasonable primary particle injection spectra superconducting cosmic strings, unlike ordinary strings or annihilating monopoles, cannot produce the HECR flux at the present epoch without violating at least the

^4

He-photodisintegration bound. The constraint from the diffuse gamma-ray background rules out the dominant production of HECR by the decay of Grand Unification particles in models with cosmological evolution assuming standard fragmentation functions. Constraints on massive black hole induced photodisintegration are also discussed.

cosmological model
helium: photofission
light nucleus: production
production: light nucleus
cosmic radiation: production
production: cosmic radiation
defect: topological
photon: cosmic radiation
black hole: massive
massive: black hole

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