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<p>In the audible axion mechanism, axion-like particles source primordial gravitational waves via their coupling to a dark Abelian gauge field. The original setup, however, relies on a large axion decay constant and coupling to produce sizable signals. In this article, we show that delaying the onset of axion oscillations opens up the testable parameter space and reduces the required coupling to <i>α</i> ≳ 1. Furthermore, we investigate the emission of gravitational waves via the axion coupling to the Standard Model photon in the presence of Schwinger pair production, generating a strong signal in the <i>μ</i>Hz or ultra-high frequency range. Cosmological constraints and gravitational wave projections are provided for both scenarios.</p>

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Supercooled audible axions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月23日

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  • Christopher Gerlach,
  • Daniel Schmitt,
  • Pedro Schwaller

摘要

In the audible axion mechanism, axion-like particles source primordial gravitational waves via their coupling to a dark Abelian gauge field. The original setup, however, relies on a large axion decay constant and coupling to produce sizable signals. In this article, we show that delaying the onset of axion oscillations opens up the testable parameter space and reduces the required coupling to α ≳ 1. Furthermore, we investigate the emission of gravitational waves via the axion coupling to the Standard Model photon in the presence of Schwinger pair production, generating a strong signal in the μHz or ultra-high frequency range. Cosmological constraints and gravitational wave projections are provided for both scenarios.