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def definition def or abbrev

rs_eta

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  34def rs_eta : ℝ := 6.1e-10

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Definition body.

  35
  36/-! ## Recombination Temperature -/
  37
  38/-- **RECOMBINATION TEMPERATURE** from Saha equation.
  39    At x_e = 0.5 (50% ionization), the Saha equation gives:
  40    k_B T* ≈ E_ion / ln(η⁻¹ × factor) ≈ 0.3 eV ≈ 3500 K
  41
  42    More precisely, T* ≈ 3000 K (accounting for detailed balance). -/

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