preprintJournal of Cosmology and Astroparticle PhysicsMay 1, 2026HYBRID OA

Miniclusters from axion string simulations

GPGiovanni PierobonJRJavier RedondoKSKen’ichi SaikawaAVAlejandro VaqueroGDGuy D. Moore

The University of Sydney · UNSW Sydney · +5 more institutions

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Abstract

Abstract The properties of axion miniclusters and of the voids between them can have very strong implications for the discovery of axions and the dark matter of the Universe. These properties can be strongly affected by axion dynamics in the early Universe, such as the axion string network and the non-linear dynamics around the QCD phase transition. Recently, improvements in numerical simulation techniques have allowed us to calculate the dark matter axion field from axion strings and QCD effects using different methods: directly with low-tension strings but high resolution [1], directly with effective high-tension strings [2], or indirectly by extrapolating an attractor solution [3]. In this work, we study…

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Topics & keywords

Topics
Keywords
  • Axion
  • Physics
  • Dark matter
  • Quantum chromodynamics
  • String (physics)
  • Particle physics
  • Universe
  • Attractor
UN Sustainable Development Goals
  • Affordable and clean energy
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