Finite field restriction estimates based on Kakeya maximal operator estimates

Abstract

In the finite field setting, we show that the restriction conjecture associated to any one of a large family of $d=2n+1$ dimensional quadratic surfaces implies the $n+1$ dimensional Kakeya conjecture (Dvir's theorem). This includes the case of the paraboloid over finite fields in which $-1$ \emph{is} a square. We are able to partially reverse this implication using the sharp Kakeya maximal operator estimates of Ellenberg, Oberlin and Tao to establish the first finite field restriction estimates beyond the Stein-Tomas exponent in this setting.

52 pages, v3: minor corrections to the additive energy estimates (section 13) v4/v5: the statement of the necessary conditions for the full conjecture have been corrected, as pointed out by Doowon Koh