Axion Miniclusters in Modified Cosmological Histories

Abstract

If the symmetry breaking leading to the origin of the axion dark matter field occurs after the end of inflation and is never restored, then overdensities in the axion field collapse to form dense objects known in the literature as axion miniclusters. The estimates of the typical minicluster mass and radius strongly depend on the details of the cosmology at which the onset of axion oscillations begin. In this work we study the properties and phenomenology of miniclusters in alternative cosmological histories and find that they can change by many orders of magnitude. Our findings have direct implications on current and future experimental searches and, in the case of discovery, could be used to learn something about the universe expansion prior to Big-Bang-Nucleosynthesis.

28 pages, 8 figures, 1 table. Matching published version. Significant improvements and new material covered over previous versions

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Cited by in corpus (44)

• The landscape of QCD axion models
• The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe
• Early seeds of axion miniclusters
• Primordial gravitational waves from NANOGrav: a broken power-law approach
• Boson Stars and Oscillatons: A Review
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• Lepto-Axiogenesis
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• Dark Matter Microhalos From Simplified Models
• The future search for low-frequency axions and new physics with the FLASH resonant cavity experiment at Frascati National Laboratories
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• The QCD Axion and Gravitational Waves in light of NANOGrav results
• Energy Spectrum of Thermalizing High Energy Decay Products in the Early Universe
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• Magnetic fields in inhomogeneous axion stars
• Fundamental physics tests using the propagation of GNSS signals
• Structure Formation with Warm White Noise: Effects of Finite Number Density and Velocity Dispersion in Particle and Wave Dark Matter
• Kination cosmology from scalar fields and gravitational-wave signatures
• Extended Haloscope Search and Exclusion of a Candidate Signal near 1.036 GHz
• Dark radiation as a probe for phase transition in the early universe