Fourier uniformity of bounded multiplicative functions in short intervals on average
: Kaisa Matomäki, Maksym Radziwiłł, Terence Tao
Publisher: Springer New York LLC
: 2020
: Inventiones Mathematicae
: Inventiones Mathematicae
: 220
: 1
: 58
: 1432-1297
DOI: https://doi.org/10.1007/s00222-019-00926-w
: https://research.utu.fi/converis/portal/detail/Publication/44132506
Let λ denote the Liouville function. We show that as X→∞ ,
∫2XXsupα∣∣∣∣∑x
for all H≥Xθ with θ>0 fixed but arbitrarily small. Previously, this was only known for θ>5/8 . For smaller values of θ this is the first “non-trivial” case of local Fourier uniformity on average at this scale. We also obtain the analogous statement for (non-pretentious) 1-bounded multiplicative functions. We illustrate the strength of the result by obtaining cancellations in the sum of λ(n)Λ(n+h)Λ(n+2h) over the ranges h