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

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Let qq be a prime power, let Θ(t)∈Fq( ⁣(t−1) ⁣)\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,k∈Nn,k\in\mathbb{N}, define

ek,n(Θ(t)):=∑i=1ℓΘ⋅Pkmax⁡{deg⁡(Ai[Θ⋅Pk](t))−n,0}∑i=1ℓΘ⋅Pkdeg⁡(Ai[Θ⋅Pk](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,

lim⁡n→∞d({k∈N:ek,n(Θ(t))>1−ε})=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}k≥0\{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.

References

Primary source

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

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