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Comment on "More Axions from Strings''

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arxiv 2109.09679 v2 pith:75R74RHL submitted 2021-09-20 astro-ph.CO hep-ph

Mark Hindmarsh , Joanes Lizarraga , Asier Lopez-Eiguren , Jon Urrestilla This is my paper · ORCID
classification astro-ph.COhep-ph
keywords arxivhubblescalingstandardcommentconsistentconstantdensity
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We comment on a claim that axion strings show a long-term logarithmic increase in the number of Hubble lengths per Hubble volume [arXiv:2007.04990], thereby violating the standard "scaling" expectation of an O(1) constant. We demonstrate that the string density data presented in [arXiv:2007.04990] are consistent with standard scaling, at a string density consistent with that obtained by us [arXiv:1908.03522, arXiv:2102.07723] and other groups. A transient slow growth in Hubble lengths per Hubble volume towards its constant scaling value is explained by standard network modelling [arXiv:2102.07723].

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Cited by 4 Pith papers

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

  1. Constant Scaling Fails for Global Monopole Networks

    hep-ph 2026-07 conditional novelty 7.0 of 10

    Global monopole networks exhibit logarithmic growth in the number-density parameter ξ rather than constant scaling, with fractional response γ ≈ 0.5 for blue-tilted initial spectra.

  2. MOSAIC: Magnonic Observations of Spin-dependent Axion-like InteraCtions

    hep-ph 2025-04 conditional novelty 6.0 of 10

    MOSAIC is a proposed scalable array of YIG magnon spheres coupled to electron-on-neon qubits that could search for electron-coupled axion dark matter with projected sensitivity beyond current ferromagnetic haloscopes.

  3. Axions at the meV Crossroads: Theory, Cosmology, Astrophysics, and Experiments

    hep-ph 2026-03 conditional novelty 2.0 of 10

    The meV axion window is presented as a coherent, cross-validated search program in which string theory, stellar cooling, dark matter, and new detector concepts converge on the same mass range.

  4. The Spectrum of Global Axion Strings

    hep-ph 2025-02 conditional novelty 2.0 of 10

    Lattice simulations of global axion string networks, corrected for discretization and oscillation effects, are extrapolated to predict the axion dark matter mass in the 95 to 450 micro-eV band.

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