Axion strings are superconducting

Abstract

We explore the cosmological consequences of the superconductivity of QCD axion strings. Axion strings can support a sizeable chiral electric current and charge, which alters their early universe dynamics. Shrinking axion string loops can become effectively stable remnants called vortons, supported by the electromagnetic force of the string current. Generically, vortons produced by axion strings overclose the universe, unless there are efficient current leakage processes. Furthermore, if a primordial magnetic field (PMF) exists in the early universe, a large current is induced on axion strings, creating a significant drag force from interactions with the surrounding plasma. As a result, the strings are slowed down, which leads to an orders of magnitude enhancement in the number of strings per Hubble volume. Finally, we study the implications for the QCD axion relic abundance. The QCD axion window is shifted by orders of magnitude in some parts of our parameter space.

arXiv comment40 pages, 11 figures

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Cited by in corpus (11)

• Primordial Black Holes from Axion Domain Wall Collapse
• Emission of gravitational waves by superconducting cosmic strings
• CMB anisotropies generated by cosmic string loops
• Quantum current dissipation in superconducting strings and vortons
• Cosmological evolution of Witten superconducting string networks
• Dynamical simulations of colliding superconducting strings
• Zero Modes of Massive Fermions Delocalize from Axion Strings
• Superconducting strings in the two-Higgs doublet model
• Neutrino emission and initial evolution of axionic quark nuggets
• Current induction and macroscopic forces for superconducting strings
• Gravitational Wave Mountains: current-carrying domain walls