Convolution of periodic multiplicative functions and the divisor problem

This is a continuation of my previous talk in Marseille. I will speak about a joint work with Maiti, Ramaré and Srivastav where we showed optimal Omega bounds for the partial sums of the convolution of two periodic multiplicative functions with bounded partial sums (sauf Dirichlet characters). I will also discuss the autocorrelations of the Delta function and how this relates with our main Theorem. This is also my goodbye from Marseille 🙂