Arithmetic cutoff bounds and sharp tail capacity for local Nyman–Beurling certificates

Scott Schubr

Abstract

We determine the sharp tail capacity of anchored arithmetic trials in the whole-line Poisson norm at λ = α + iT, 1/2 < α < 1. After a prescribed exterior null is imposed, the complete norm has an M⁻¹ tail with a positive gcd-variance coefficient and an explicit period-free remainder. The normalized coefficient has exact infimum [12(ζ(2)ζ(2α)/|ζ(1+λ)|² − 1)]⁻¹. Finite constrained capacities approach this limit at an explicit rate uniform in T. A dyadic factor imposes the null while preserving arbitrarily much projection gain at a paid support cost, yielding complete finite arithmetic lower certificates. Complementarily, an exact weighted divisor dual gives g_N(λ) ≤ K_α N^(2−2α)|ζ(λ)|² for all anchored complex coefficients supported on the integers at most N. The power is exact for the unrestricted head reconstruction norm. Montgomery’s unconditional small-value theorem then gives a necessary support-cutoff growth rate for an all-height positive gain.

Arithmetic cutoff bounds and sharp tail capacity for local Nyman–Beurling certificates

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