Dynamical Systems Seminar

Title: Ergodicity of the Liouville system implies the Chowla conjecture
Speaker: Nikos Frantzikinakis
Speaker Info: University of Crete
Brief Description:
Special Note:

The Liouville function assigns the value one to integers with an even number of prime factors and minus one elsewhere. Its importance stems from the fact that several well known conjectures in number theory can be rephrased as conjectural properties of the Liouville function. A conjecture of Chowla asserts that the signs of the Liouville function are distributed randomly on the integers, that is, they form a normal sequence of plus and minus ones. Reinterpreted in the language of ergodic theory this conjecture asserts that the "Liouville system" is a Bernoulli system. We prove that a much weaker property, namely, ergodicity of the "Liouville system", implies the Chowla conjecture. Our argument combines techniques from ergodic theory, analytic number theory, and higher order Fourier analysis.
Date: Tuesday, April 11, 2017
Time: 4:00pm
Where: Lunt 104
Contact Person: Prof. Bryna Kra
Contact email: kra@math.northwestern.edu
Contact Phone: 847-491-5567
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