def
definition
def or abbrev
rs_drag_redshift
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99def rs_drag_redshift : ℝ := 1060
proof body
Definition body.
100
101/-- **SOUND HORIZON** (simplified formula valid for matter+radiation):
102 r_s ≈ (2/3) × (c / k_eq) × √(6/R_eq) × ln[...]
103 where k_eq is the wavenumber at matter-radiation equality.
104
105 Numerically: r_s ≈ 147 Mpc. -/