Big Bang synthesis of nuclear dark matter



Hardy, Edward ORCID: 0000-0003-3263-6575, Lasenby, Robert, March-Russell, John and West, Stephen M
(2015) Big Bang synthesis of nuclear dark matter. The Journal of High Energy Physics, 2015 (6). 11-.

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Abstract

We investigate the physics of dark matter models featuring composite bound states carrying a large conserved dark “nucleon” number. The properties of sufficiently large dark nuclei may obey simple scaling laws, and we find that this scaling can determine the number distribution of nuclei resulting from Big Bang Dark Nucleosynthesis. For plausible models of asymmetric dark matter, dark nuclei of large nucleon number, e.g. ≳ 108, may be synthesised, with the number distribution taking one of two characteristic forms. If small-nucleon-number fusions are sufficiently fast, the distribution of dark nuclei takes on a logarithmically-peaked, universal form, independent of many details of the initial conditions and small-number interactions. In the case of a substantial bottleneck to nucleosynthesis for small dark nuclei, we find the surprising result that even larger nuclei, with size ≫ 108, are often finally synthesised, again with a simple number distribution. We briefly discuss the constraints arising from the novel dark sector energetics, and the extended set of (often parametrically light) dark sector states that can occur in complete models of nuclear dark matter. The physics of the coherent enhancement of direct detection signals, the nature of the accompanying dark-sector form factors, and the possible modifications to astrophysical processes are discussed in detail in a companion paper.

Item Type: Article
Additional Information: 27 pages, 5 figures, v3; minor additional comments - matches published version
Uncontrolled Keywords: Beyond Standard Model, Cosmology of Theories beyond the SM
Depositing User: Symplectic Admin
Date Deposited: 13 May 2020 14:49
Last Modified: 18 Jan 2023 23:52
DOI: 10.1007/JHEP06(2015)011
Open Access URL: https://link.springer.com/article/10.1007%2FJHEP06...
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URI: https://livrepository.liverpool.ac.uk/id/eprint/3087222