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Main Authors: Cornean, Horia D., Sørensen, Kasper S.
Format: Preprint
Published: 2025
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Online Access:https://arxiv.org/abs/2502.17113
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author Cornean, Horia D.
Sørensen, Kasper S.
author_facet Cornean, Horia D.
Sørensen, Kasper S.
contents We consider base-$β$ expansions of Parry's type, where $a_0 \geq a_1 \geq 1$ are integers and $a_0<β<a_0+1$ is the positive solution to $β^2 = a_0β+ a_1$ (the golden ratio corresponds to $a_0=a_1=1$). The map $x\mapsto βx-\lfloor βx\rfloor$ induces a discrete dynamical system on the interval $[0,1)$ and we study its associated transfer (Perron-Frobenius) operator $\mathscr{P}$. Our main result can be roughly summarized as follows: we explicitly construct two piecewise affine functions $u$ and $v$ with $\mathscr{P}u=u$ and $\mathscr{P}v=β^{-1} v$ such that for every sufficiently smooth $F$ which is supported in $[0,1]$ and satisfies $\int_0^1 F \; \mathrm{d} x=1$, we have $\mathscr{P}^kF= u +β^{-k}\big ( F(1)-F(0)\big )v +o(β^{-k})$ in $L^\infty$. This is also compared with the case of integer bases, where more refined asymptotic formulas are possible.
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id arxiv_https___arxiv_org_abs_2502_17113
institution arXiv
publishDate 2025
record_format arxiv
spellingShingle Sharp iteration asymptotics for transfer operators induced by greedy $β$-expansions
Cornean, Horia D.
Sørensen, Kasper S.
Dynamical Systems
37 (Primary) 39, 40, 47 (Secondary)
We consider base-$β$ expansions of Parry's type, where $a_0 \geq a_1 \geq 1$ are integers and $a_0<β<a_0+1$ is the positive solution to $β^2 = a_0β+ a_1$ (the golden ratio corresponds to $a_0=a_1=1$). The map $x\mapsto βx-\lfloor βx\rfloor$ induces a discrete dynamical system on the interval $[0,1)$ and we study its associated transfer (Perron-Frobenius) operator $\mathscr{P}$. Our main result can be roughly summarized as follows: we explicitly construct two piecewise affine functions $u$ and $v$ with $\mathscr{P}u=u$ and $\mathscr{P}v=β^{-1} v$ such that for every sufficiently smooth $F$ which is supported in $[0,1]$ and satisfies $\int_0^1 F \; \mathrm{d} x=1$, we have $\mathscr{P}^kF= u +β^{-k}\big ( F(1)-F(0)\big )v +o(β^{-k})$ in $L^\infty$. This is also compared with the case of integer bases, where more refined asymptotic formulas are possible.
title Sharp iteration asymptotics for transfer operators induced by greedy $β$-expansions
topic Dynamical Systems
37 (Primary) 39, 40, 47 (Secondary)
url https://arxiv.org/abs/2502.17113