Imprints of the Early Universe on Axion Dark Matter Substructure

Despite considerable experimental progress large parts of the axion-like particle (ALP) parameter space remain difficult to probe in terrestrial experiments. In some cases, however, small-scale structure of the ALP dark matter (DM) distribution is strongly enhanced, offering opportunities for astrophysical tests. Such an enhancement can be produced by a period of pre-nucleosynthesis early matter domination (EMD). This cosmology arises in many ultraviolet completions and generates the correct relic abundance for weak coupling $f_a\sim 10^{16}$ GeV, ALP masses in the range $10^{-13}$ eV $

Keywords:

• Universe
• Quantum chromodynamics
• Axion
• Parameter space
• Physics
• Astrophysics
• Pulsar
• Cosmology
• Dark matter
• Substructure
• Particle physics

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