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"Nonbaryonic" Dark Matter as Baryonic Color Superconductor
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"Nonbaryonic" Dark Matter as Baryonic Color Superconductor
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We discuss a novel cold dark matter candidate which is formed from the ordinary quarks during the QCD phase transition when the axion domain wall undergoes an unchecked collapse due to the tension in the wall. If a large number of quarks is trapped inside the bulk of a closed axion domain wall, the collapse stops due to the internal Fermi pressure. In this case the system in the bulk, may reach the critical density when it undergoes a phase transition to a color superconducting phase with the ground state being the quark condensate, similar to the Cooper pairs in BCS theory. If this happens, the new state of matter representing the diquark condensate with a large baryon number $B \sim 10^{32}$ becomes a stable soliton-like configuration. Consequently, it may serve as a novel cold dark matter candidate.
Forward citations
Cited by 3 Pith papers
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Baryoid Dark Matter from $\mathbb{Z}_N$ Domain Walls: The $(N-1):1$ origin of the dark matter-baryon coincidence
Collapsing Z_N domain walls trap baryons into dense baryoids, yielding a dark matter-baryon energy density ratio of approximately (N-1):1 after the QCD phase transition.
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Towards the Direct Detection of Composite Ultraheavy Dark Matter in Quantum Sensor Arrays
A quantum sensor array could be sensitive to Planck-mass composite dark matter with radii around a centimeter via Yukawa forces, with a signal that scales as λ² instead of exponentially for short screening lengths.
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The Glow of Axion Quark Nugget Dark Matter: (IV) CMB Spectral and Anisotropy Signatures
Axion quark nugget dark matter would create a μ-type CMB spectral distortion near 6×10⁻⁸ with y near 2×10⁻⁹, detectable by proposed missions, while leaving CMB anisotropies essentially unchanged.
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