Directional maximum conjecture for the logarithmic derivative of the Riemann zeta function

Fix ϵ(0,12)\epsilon\in(0,\frac12). For T>0T>0, consider the interval [T,2T][T,2T], and let ζ(s)\zeta(s) denote the Riemann zeta function. Directional maximum conjecture. As TT\to\infty,

maxTt2TRe(eiθζζ(σ+it))maxTt2Tζ(σ+it)maxTt2Tζ(σ+it),\max_{T\le t\le 2T}\operatorname{Re}\left(e^{-\mathrm{i}\theta}\frac{\zeta'}{\zeta}(\sigma+\mathrm{i}t)\right)\sim\frac{\displaystyle\max_{T\le t\le 2T}|\zeta'(\sigma+\mathrm{i}t)|}{\displaystyle\max_{T\le t\le 2T}|\zeta(\sigma+\mathrm{i}t)|},

uniformly for all θ[0,2π]\theta\in[0,2\pi] and all σ[12+ϵ,1]\sigma\in[\frac12+\epsilon,1]. The source presents this as the zeta-function analogue of the preceding Dirichlet LL-function conjecture and gives no evidence of a resolution.

Sources & referencesView supporting material

Primary source

Daodao Yang, “Omega theorems for logarithmic derivatives of zeta and L-functions”, arXiv:2311.16371 (2023).

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