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Axion strings are superconducting

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arxiv 2010.02763 v4 pith:67NOGT6F submitted 2020-10-06 hep-ph

Hajime Fukuda , Aneesh V. Manohar , Hitoshi Murayama , Ofri Telem This is my paper · ORCID
classification hep-ph
keywords axionstringscurrentuniverseearlyforcemagnitudeorders
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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.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Gravitational Waves from Superconducting Cosmic Strings

    astro-ph.CO 2026-07 conditional novelty 7.0 of 10

    Lattice simulations show the gravitational-wave spectrum from superconducting cosmic strings develops a coupling-dependent suppression at high frequencies, distinguishing them from ordinary Abelian–Higgs strings.

  2. Massless monopole-string-domain wall fermions and polyhedral vacuum fermions

    hep-th 2025-06 conditional novelty 6.0 of 10

    The exact fermion zero mode on any BPS monopole-string-domain wall background takes the profile f=Ω^{-h/4}, and its localization moves among monopoles, strings, domain walls, and convex polyhedral vacuum regions with ...

  3. Unpaired Weyl fermion on an axion string in a finite lattice

    hep-th 2025-06 conditional novelty 6.0 of 10

    A modified crossed-domain-wall axion string on an N=28 periodic lattice produces an unpaired, single-chirality Weyl fermion branch, extending the Kaplan-Sen disk construction to string defects.

  4. Cosmic strings and domain walls of the QCD quark condensate with and without a hidden axion

    hep-ph 2025-05 conditional novelty 6.0 of 10

    The QCD quark condensate supports eta-prime and pion string-wall defects that exist without a hidden axion, and these windings make the minimal axion string anomaly-free.

  5. Stochastic Gravitational Wave Background from Chiral Superconducting Cosmic Strings

    astro-ph.CO 2024-12 conditional novelty 6.0 of 10

    Superconducting cosmic string loops emit vector radiation whose strength is fitted in this paper; including this channel suppresses the predicted gravitational wave background for strong coupling and can make the spec...

  6. Stability of Superconducting Strings

    hep-ph 2024-12 conditional novelty 6.0 of 10

    Lattice simulations and S-matrix calculations show superconducting string loops relax to stable vortons, with fermion escape and decay rates suppressed below previous estimates.

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