Two-Distance Sets over Finite Fields

We study two-distance sets in standard $d$-dimensional quadratic spaces over finite fields.

In characteristic $3$, we construct sets attaining the full Larman--Rogers--Seidel bound, showing that Blokhuis' Euclidean bound $\binom{d+2}{2}$ need not hold over finite fields.

We prove a rank-sensitive replacement which precisely measures the failure of positive definiteness.

We also show that the Blokhuis bound $\binom{d+2}{2}$ is attained over a suitable finite field exactly for each $d\neq6$; in the exceptional dimension $d=6$, the exact maximum is $27$.