Big bang darkleosynthesis

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• 作者：Gordan Krnjaic^a ; ^{gkrnjaic@perimeterinstitute.ca" class="auth_mail" title="E-mail the corresponding author} ; Kris Sigurdson^b
• 刊名：Physics Letters B
• 出版年：2015
• 出版时间：17 December 2015
• 年：2015
• 卷：751
• 期：Complete
• 页码：464-468
• 全文大小：793 K

文摘

In a popular class of models, dark matter comprises an asymmetric population of composite particles with short range interactions arising from a confined nonabelian gauge group. We show that coupling this sector to a well-motivated light mediator particle yields efficient darkleosynthesis  , a dark-sector version of big-bang nucleosynthesis (BBN), in generic regions of parameter space. Dark matter self-interaction bounds typically require the confinement scale to be above Λ_QCD${\mathrm{\Lambda }}_{\mathit{QCD}}$, which generically yields large (≫MeV/dark-nucleon$\gg \text{MeV}/\text{dark-nucleon}$) binding energies. These bounds further suggest the mediator is relatively weakly coupled, so repulsive forces between dark-sector nuclei are much weaker than Coulomb repulsion between standard-model nuclei, which results in an exponential barrier-tunneling enhancement over standard BBN. Thus, darklei   are easier to make and harder to break than visible species with comparable mass numbers. This process can efficiently yield a dominant population of states with masses significantly greater than the confinement scale and, in contrast to dark matter that is a fundamental particle, may allow the dominant form of dark matter to have high spin (3285f5fa445109" title="Click to view the MathML source">S≫3/2$S\gg 3/2$), whose discovery would be smoking gun evidence for dark nuclei.