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 -/