Electromagnetic Cascade in the Early Universe and its Application to the Big-Bang Nucleosynthesis

Details Electromagnetic Cascade in the Early Universe and its Application to the Big-Bang Nucleosynthesis Electromagnetic Cascade in the Early Universe and its Application to the Big-Bang Nucleosynthesis

1994-12-16

arxiv.org/abs/astro-ph/9412055v1

Astrophys.J. 452 (1995) 506

Astronomy and Astrophysics

Astrophysics

21pages (compressed and uuencoded postscript file including 6 figures)

Scientific paper

10.1086/176324

We investigate the electromagnetic cascade initiated by injection of very high energy photons in the early Universe and calculate the cascade spectrum by solving a set of Boltzmann equations numerically. In the calculation we take account of Compton scattering off the background electrons and pair creation off the background nucleons as well as photon-photon processes and inverse Compton scattering. We also apply our cascade spectrum to the big bang nucleosynthesis with photo-dissociation processes due to heavy unstable particles and obtain the constraint on their lifetime and abundance.

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