Pointwise upper-bound conjecture for logarithmic derivatives of Dirichlet LL-functions

Fix σ(12,1)\sigma\in(\frac12,1). Let qq be a sufficiently large integer, let χ\chi be a primitive character modulo qq, and let L(s,χ)L(s,\chi) be its Dirichlet LL-function. Pointwise upper-bound conjecture. For all sufficiently large integers qq and all primitive characters χ (modq)\chi\ (\operatorname{mod} q),

LL(σ,χ)σ(logq)1σ(log2q)1σ.\left|\frac{L'}{L}(\sigma,\chi)\right|\ll_{\sigma}(\log q)^{1-\sigma}(\log_2 q)^{1-\sigma}.

The source presents this as the Dirichlet LL-function counterpart of the preceding zeta bound and does not give a resolution in the supplied text.

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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