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Scaling density of axion strings
(APS, 2020-01-16)
In the QCD axion dark matter scenario with postinflationary Peccei-Quinn symmetry breaking, the number density of axions, and hence the dark matter density, depends on the length of string per unit volume at cosmic time ...
Irreducible background of gravitational waves from a cosmic defect network: update and comparison of numerical techniques
(APS, 2020-11-13)
Cosmological phase transitions in the early Universe may produce relics in the form of a network of cosmic defects. Independently of the order of a phase transition, topology of the defects, and their global or gauge nature, ...