The effects of cold dark matter on standard big bang nucleosynthesis

Details The effects of cold dark matter on standard big bang nucleosynthesis The effects of cold dark matter on standard big bang nucleosynthesis

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nuphb.329..464h&link_type=abstract

Nuclear Physics B, Volume 329, Issue 2, p. 464-492.

Physics

Nuclear Physics

8

Scientific paper

We show that the annihilation of cold, weakly-interacting dark matter candidates (χ) subsequent to χχ freeze-out can significantly affect the primordial abundance of light elements. The largest effects are (i) between the n/p freeze-out temperature (T ⋍ 0.7 MeV) and the onset of nucleosynthesis at T ⋍ 0.1 MeV, χχ annihilations increase the n/p ratio, leading to increased 4He production; (ii) following 4He synthesis, baryonic products p, n, n of χχ annihilations dissociate some of the 4he into D and 3He, leading to increased D + 3He abundances; (iii) toward the end of nucleosynthesis, neutrons from χχ annihilation lead to n + 7Be --> p + 7Li, resulting in increased 7Li + 7Be production for low values of η ≡ nb/nγ and decreased 7Li + 7Be production for large η and (iv) long after nucleosynthesis, once the universe cools below T ⋍ 1 keV, the electromagnetic shower produced by electrons, positrons and photons from residual χχ annihilations causes further dissociation of 4He, leading to increased D + 3He abundances. The most important result is that for Dirac and Majorana neutrinos, the 7Li constraints on η from SBBN are significantly affected, with larger values of η being favored. A summary of scattering rates for processes in the electromagnetic shower, including corrections to numerous misprints in other sources, is presented in the appendix.

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