Oscillatory Integral Operators Along the Paraboloid and Applications

We prove decay estimates for oscillatory integral operators along $(y_1,y_2,y_1^2+y_2^2)$ in the finite field and the continuous settings. In the continuous setting, our result allows a bi-parameter maximal modulation, which extends the one-parameter version previously established by Pierce and Yung. Our approach is different from theirs. Then we discuss three applications of our estimates: a power saving bound for certain pattern finding problem in finite fields, a short approach to $L^p$ boundedness of an one-parameter Pierce–Yung operator, and $L^p$ boundedness of a bi-parameter Pierce–Yung operator.