Full generic escape-of-mass conjecture for quadratic Laurent series

Let qq be a prime power, let Θ(t)Fq( ⁣(t1) ⁣)\Theta(t)\in\mathbb{F}_q(\!(t^{-1})\!) be quadratic irrational, and let P(t)Fq[t]P(t)\in\mathbb{F}_q[t] be irreducible. For n,kNn,k\in\mathbb{N}, define

ek,n(Θ(t)):=i=1ΘPkmax{deg(Ai[ΘPk](t))n,0}i=1ΘPkdeg(Ai[ΘPk](t)).e_{k,n}(\Theta(t)):=\frac{\sum_{i=1}^{\ell_{\Theta\cdot P^k}}\max\left\{\operatorname{deg}\left(A_i^{[\Theta\cdot P^k]}(t)\right)-n,0\right\}}{\sum_{i=1}^{\ell_{\Theta\cdot P^k}}\operatorname{deg}\left(A_i^{[\Theta\cdot P^k]}(t)\right)}.

Full generic escape of mass means that for every ε>0\varepsilon>0,

limnd({kN:ek,n(Θ(t))>1ε})=1,\lim_{n\rightarrow\infty}d\left(\left\{k\in\mathbb{N}:e_{k,n}(\Theta(t))>1-\varepsilon\right\}\right)=1,

where dd denotes the natural density. Full generic escape-of-mass conjecture. The series Θ(t)\Theta(t) exhibits full generic escape of mass with respect to the sequence {P(t)k}k0\{P(t)^k\}_{k\geq 0}.

The paper proves the corresponding assertion for the pp-Cantor sequence with P(t)=tP(t)=t in odd characteristic, and cites the analogous Thue–Morse result. The general polynomial and quadratic-irrational statement remains open in the supplied text.

Sources & referencesView supporting material

Primary source

Noy Soffer Aranov and Steven Robertson, “Escape of Mass of the p-Cantor Sequence”, arXiv:2510.19417 (2025).

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