Geometric progressions in distance sets in odd dimensions over prime fields

For $E\subset\mathbb{F}_p^d$, let $Δ(E)=\{Q_d(x-y):x,y\in E\}$, where $Q_d(z)=z_1^2+\cdots+z_d^2$. We introduce and study the problem of the existence of nondegenerate three-term geometric progressions in the distance set $Δ(E)$ when $d$ is odd. If $M_{GP,d}(p)$ denotes the largest size of a set whose distance set contains no such progression, then, for every prime $p\geq7$ and every integer $m\geq0$, \[ p^mM_{GP,1}(p)\leq M_{GP,2m+1}(p) \leq4p^mM_{GP,1}(p). \] For all sufficiently large primes $p$, we also prove \[ p^{m+\frac{7}{26}}\leq M_{GP,2m+1}(p) \leq Cp^{m+\frac{16}{25}}, \] where $C$ is an absolute positive constant.

Authors

Publication Details

Journal
arXiv (Cornell University)
Published
2026-10-26
DOI
https://doi.org/10.48550/arxiv.2610.34758
Primary Topic
Limits and Structures in Graph Theory
Type
preprint
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preprint

Geometric progressions in distance sets in odd dimensions over prime fields

Boqing Xue, Dung The Tran, Thang Pham
arXiv (Cornell University)
Limits and Structures in Graph Theory
preprint

Geometric progressions in distance sets in odd dimensions over prime fields

Boqing Xue, Dung The Tran, Thang Pham
preprint en

Abstract

For $E\subset\mathbb{F}_p^d$, let $Δ(E)=\{Q_d(x-y):x,y\in E\}$, where $Q_d(z)=z_1^2+\cdots+z_d^2$. We introduce and study the problem of the existence of nondegenerate three-term geometric progressions in the distance set $Δ(E)$ when $d$ is odd. If $M_{GP,d}(p)$ denotes the largest size of a set whose distance set contains no such progression, then, for every prime $p\geq7$ and every integer $m\geq0$, \[ p^mM_{GP,1}(p)\leq M_{GP,2m+1}(p) \leq4p^mM_{GP,1}(p). \] For all sufficiently large primes $p$, we also prove \[ p^{m+\frac{7}{26}}\leq M_{GP,2m+1}(p) \leq Cp^{m+\frac{16}{25}}, \] where $C$ is an absolute positive constant.

arXiv (Cornell University)
Limits and Structures in Graph Theory
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