On the asymptotic growth of the norm of the partial sum operator on $\mathscr H^1$

Source abstract

We show that the norm of the partial sum operator $S_N$ on the Hardy space $\mathscr H^1$ of Dirichlet series satisfies $$\liminf_{N\to\infty}\frac{\log\log N}{\log N}\lVert S_N\rVert_{\mathscr H^1\to\mathscr H^1}\geq\frac{1-\log 2}{2π}.$$ Combined with an upper bound of Bondarenko, Brevig, Saksman and Seip, this shows that $$\lVert S_N\rVert_{\mathscr H^1\to\mathscr H^1}\asymp\frac{\log N}{\log\log N}$$ as $N\to\infty$.