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Mixing time of fractional random walk on finite fields

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arxiv 2102.02781 v3 pith:MHBUDQPW submitted 2021-02-04 math.PR math.COmath.GRmath.NT

classification math.PRmath.COmath.GRmath.NT
keywords varepsilonmixingrandomtimewalkanalogueansweringchatterjee
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abstract

We study a random walk on $\mathbb{F}_p$ defined by $X_{n+1}=1/X_n+\varepsilon_{n+1}$ if $X_n\neq 0$, and $X_{n+1}=\varepsilon_{n+1}$ if $X_n=0$, where $\varepsilon_{n+1}$ are independent and identically distributed. This can be seen as a non-linear analogue of the Chung--Diaconis--Graham process. We show that the mixing time is of order $\log p$, answering a question of Chatterjee and Diaconis.

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