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structure definition def or abbrev

Axion

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formal statement (Lean)

 118structure Axion where
 119  mass : ℝ  -- eV
 120  decay_constant : ℝ  -- GeV
 121
 122/-- Primordial black holes: BHs from early universe
 123    - Mass range: 10⁻¹⁸-10⁵ M_sun (windows remain)
 124    - Form from density perturbations
 125    - Status: Some windows still open -/

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