Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-02-15
JCAP 0310:010,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
Title changed. Two figures and Appendix added. Part on baryogenesis is removed and posted as a separate paper hep-ph/0309086
Scientific paper
10.1088/1475-7516/2003/10/010
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.
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