The Szemerédi-Trotter Estimate in Finite Field with its Applications

Source abstract

We prove a sharp Szemerédi-Trotter estimate $$\mathcal{I}(A,\mathcal{L})\lesssim \frac{|A||\mathcal{L}|}{p}+|A|^{2/3}|\mathcal{L}|^{2/3}+|A|+|\mathcal{L}|$$ for prime finite field $\mathbb{F}=\mathbb{F}_p$ by a new polynomial decomposition theorem. As applications, we first prove the sharp Furstenberg set estimate in $\mathbb{F}^2$. Secondly, we improve sum-product estimate $$\max\{|A+A|,|A\cdot A|\}\gtrsim\min\{(p|A|)^{1/2},|A|^{5/4}\},\quad A\subset\mathbb{F}.$$ Finally, we improve the Fourier restriction estimate $R^*(2\toα)$ holds for $α>\frac{10}{3}$ in $\mathbb{F}^3$ when $p\equiv 3\mod 4$.