Observing invisible axions with gravitational waves

被引：71

作者：

Gorghetto, Marco ^{[1
]}

Hardy, Edward ^{[2
]}

Nicolaescu, Horia ^{[2
]}

机构：

[1] Weizmann Inst Sci, Dept Particle Phys & Astrophys, Herzl St 234, IL-761001 Rehovot, Israel

[2] Univ Liverpool, Dept Math Sci, Liverpool L69 7ZL, Merseyside, England

来源：

JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS | 2021年 / 06期

关键词：

axions; Cosmic strings; domain walls; monopoles; gravitational waves / theory; cosmology of theories beyond the SM; COSMIC-STRING EVOLUTION; GLOBAL SYMMETRIES; DOMAIN-WALLS; INFLATION; FLUCTUATIONS; PHYSICS; PERTURBATIONS; INVARIANCE; RADIATION; GOLDSTONE;

D O I：

10.1088/1475-7516/2021/06/034

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

If the Peccei-Quinn symmetry associated to an axion has ever been restored after inflation, axion strings inevitably produce a contribution to the stochastic gravitational wave background. Combining effective field theory analysis with numerical simulations, we show that the resulting gravitational wave spectrum has logarithmic deviations from a scale invariant form with an amplitude that is significantly enhanced at low frequencies. As a result, a single ultralight axion-like particle with a decay constant larger than 10(14) GeV and any mass between 10(-18) eV and 10(-28) eV leads to an observable gravitational wave spectrum and is compatible with constraints on the post-inflationary scenario from dark matter overproduction, isocurvature and dark radiation. Since the spectrum extends over a wide range of frequencies, the resulting signal could be detected by multiple experiments. We describe straightforward ways in which the Peccei-Quinn symmetry can be restored after inflation for such decay constants. We also comment on the recent possible NANOgrav signal in light of our results.

引用

页数：78

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