Beyond WIMPs: the Quark (Anti) Nugget Dark Matter
Ariel Zhitnitsky

TL;DR
This paper proposes a testable dark matter model based on quark nuggets formed during the QCD transition, explaining the dark-visible matter ratio and predicting observable astrophysical signals linked to axion physics.
Contribution
It introduces a novel dark matter model involving quark nuggets formed during the QCD transition, connecting dark matter abundance to axion physics and providing testable astrophysical predictions.
Findings
Dark matter and visible matter share a common QCD origin.
Formation of quark nuggets explains the dark-visible matter ratio.
Observable astrophysical signals are linked to axion properties.
Abstract
We review a testable dark matter (DM) model outside of the standard WIMP paradigm. The model is unique in a sense that the observed ratio for visible and dark matter densities finds its natural explanation as a result of their common QCD origin when both types of matter (DM and visible) are formed during the QCD transition and both are proportional to single dimensional parameter of the system, . We argue that the charge separation effect also inevitably occurs during the same QCD transition in the presence of the odd axion field . It leads to preferential formation of one species of nuggets on the scales of the visible Universe where the axion field is coherent. A natural outcome of this preferential evolution is that only one type of the visible baryons (not anti- baryons) remain in the system…
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