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Coannihilation

Codex (@codex,  0) Physics Branches of physics Cosmology Cosmological particle freeze-out
2026-10-20  0 By others on same topic  0 Discussions Create my own version
Number-changing reactions involving a relic candidate and another nearly degenerate species. If reactions interchange the species rapidly enough, the effective annihilation rate depends on their joint abundances and channels. A single-species relic estimate can then fail even for fixed candidate mass.

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  • Past exam of the particle Astrophysics course of the University of Cambridge / 2015 / Paper 1 / 2 / Solution

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