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Minimizing GCD sums, multiplicative energy and applications

Date: Thursday, April 4, 2019 11:00 - 12:00
Speaker: Marc Munsch (Uni Graz)
Location: Raiffeisen Lecture Hall, Central Building
Series: Mathematics and CS Seminar
Host: Tim Browning
Contact: MARR Lena
Central building lecture hall

In recent years, the question of maximizing GCD sums regained interest due to its firm link with large values of L-functions, leading for instance to the breakthrough improvement of Bondarenko and Seip concerning the maximum of |ζ(1/2+it)|. In this talk, we address the counterpart problem of minimizing weighted GCD sums and show that it appears naturally in some applications. We consider as well a related optimization question regarding the usual multiplicative energy of a subset of the first N integers. We derive from our results some consequences for short character sums and non-vanishing of theta functions.

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