Dark Matter as Dense Quark Aggregates Stabilized by Axion Walls

This paper introduces the QCD-AQN framework, a novel approach to understanding the nature of dark matter. The central hypothesis is that dark matter consists of macroscopic composite objects, specifically dense aggregates of quarks and antiquarks, stabilized by axion domain walls. This framework proposes a unified explanation for both dark matter and the observed matter-antimatter asymmetry in the universe, addressing two fundamental problems in cosmology. The authors emphasize the importance of existing observational constraints and propose observational tests to validate the framework. The exploration of a possible QCD-based scenario for dark energy further expands the scope of the research. The strength of this approach lies in its attempt to connect dark matter to fundamental particle physics, offering a potentially testable model. However, the reliance on specific QCD dynamics and the existence of axions introduces challenges in terms of observational verification. Alternative dark matter candidates and models remain viable, and further research is needed to assess the validity and predictive power of the QCD-AQN framework. The success of this framework will depend on its ability to withstand observational scrutiny and provide a more compelling explanation for dark matter than existing alternatives.

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