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def definition def or abbrev

spectralIndex

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formal statement (Lean)

 137noncomputable def spectralIndex (φ : ℝ) (hφ : φ > 0) : ℝ :=

proof body

Definition body.

 138  1 - 6 * slowRollEpsilon φ hφ + 2 * slowRollEta φ hφ
 139
 140/-- **THEOREM (Nearly Scale-Invariant Spectrum)**: n_s ≈ 1 for slow-roll.
 141    Planck measures n_s = 0.965 ± 0.004. -/

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