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LeanPool.EscauriazaSereginSverak.Endpoint.BlowupLimitPairingModulus

Time moduli from a space-time flux bound #

A uniform local L^(3/2) bound for the scalar flux in a smooth-test pairing gives the endpoint-compatible power modulus used in lem:compactness of the CKN manuscript.

theorem ESS.blowup_limit_interval_pairing_modulus_of_spacetime_flux {C : Set CKN.Foundation.Parabolic.Vec3} (hC : IsCompact C) (a b M : ℝ) (hM : 0 ≤ M) (F : ℕ → CKN.Foundation.Parabolic.ParabolicPoint → ℝ) (G : ℕ → ℝ → ℝ) (hF : ∀ (n : ℕ), MeasureTheory.MemLp (F n) (3 / 2) (MeasureTheory.volume.restrict (C ×ˢ Set.Icc a b)) ∧ MeasureTheory.eLpNorm (F n) (3 / 2) (MeasureTheory.volume.restrict (C ×ˢ Set.Icc a b)) ≤ ENNReal.ofReal M) (hformula : ∀ (n : ℕ) (s t : ℝ), s ∈ Set.Icc a b → t ∈ Set.Icc a b → s ≤ t → G n t - G n s = ∫ (z : CKN.Foundation.Parabolic.Vec3 × ℝ) in C ×ˢ Set.Ioc s t, F n z) (n : ℕ) (s t : ℝ) :
s ∈ Set.Icc a b → t ∈ Set.Icc a b → |G n t - G n s| ≤ M * ((MeasureTheory.volume C).toReal * dist t s) ^ (1 / 3)

A spacetime L^(3/2) flux bound controls its time-integrated pairing on every subrectangle, with the interval length appearing in the modulus.