Parabolic natural-measure conjecture for large quadratic Weyl sums

Define

E2,1/2={xT2:S2(x;N)N1/2 for infinitely many NN}.\mathcal E_{2,1/2}=\{\mathbf x\in\mathsf{T}_2:|S_2(\mathbf x;N)|\geq N^{1/2}\text{ for infinitely many }N\in\mathbb N\}.

Let X={(t,t2):t[0,1]}\mathcal X=\{(t,t^2):t\in[0,1]\} and let μ\mu be the natural probability measure on X\mathcal X. Parabolic natural-measure conjecture.

μ(E2,1/2X)=1.\mu(\mathcal E_{2,1/2}\cap\mathcal X)=1.

This asserts that the large-values property at the critical exponent holds for almost every point of the parabola with respect to its natural measure; the source supplies no resolution.

Sources & referencesView supporting material

Primary source

Changhao Chen and Igor E. Shparlinski, “Small values of Weyl sums”, arXiv:1907.03101 (2019).

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