Does weakly interacting dark matter change the primordial abundance of light elements?

Details Does weakly interacting dark matter change the primordial abundance of light elements? Does weakly interacting dark matter change the primordial abundance of light elements?

Dec 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988phlb..215..397h&link_type=abstract

Physics Letters B, Volume 215, Issue 2, p. 397-403.

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 (1) χχ annihilations increase the n/p ratio prior to and during nucleosynthesis, leading to increased 4He production, and (2) χχ annihilations following helium synthesis dissociate some of the 4He into 3He and D, leading to increased D+3He abundances. Assuming ϱχ = ϱc, we find that massive Dirac neutrinos can cause overproduction of D+3He for values of the Hubble parameter h >~ 0.7, while Majorana neutrinos, higgsinos and photinos can lead to observable effects for Mχ >~ 6 GeV.

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