Conjecture on the asymptotic periodicity of zeros of zeta derivatives

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Let M≥2M\geq 2 be a natural number, let ε>0\varepsilon>0, and let qMq_M denote the parameter associated with the MM-th critical strip. For each derivative order kk, consider the zeros of ζ(k)(s)\zeta^{(k)}(s).

Asymptotic periodicity conjecture. For all ε>0\varepsilon>0 and natural numbers MM and N≥2N\geq 2 there is K∈NK\in\mathbb{N} such that for all k>Kk>K there exists s∈Cs\in\mathbb{C} and j∈Zj\in\mathbb{Z} with

∣s−(k⋅qM+(2j+1)πlog⁡(M+1M)⋅i)∣<ε\left|s-\left(k\cdot q_M+\frac{(2j+1)\pi}{\log\left(\frac{M+1}{M}\right)}\cdot i\right)\right|<\varepsilon

and ζ(k)(s)=0\zeta^{(k)}(s)=0.

The conjecture predicts that the zeros in the critical strips become asymptotically periodic as the derivative order grows. The surrounding discussion derives the candidate imaginary parts from the limiting equation for adjacent Dirichlet-polynomial terms, but does not establish the asserted approximation for zeros.

References

Primary source

Thomas Binder, Sebastian Pauli and Filip Saidak, “Zeros of high derivatives of the Riemann Zeta function”, arXiv:1002.0362 (2023).

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