Algebraic Stability of Oscillatory Integral Estimates: A Calculus for Uniform Estimates

Abstract: Oscillatory integrals arise in many situations where it is important to obtain decay estimates which are stable under certain perturbations of the phase. Examining the structural problems underpinning these estimates leads one to consider sublevel set estimates, which behave nicely under certain algebraic operations such as composition with a polynomial. This motivates us to ask how oscillatory integral estimates behave under such transformations of the phase, and under some natural higher order convexity assumptions we obtain stable estimates under composition with polynomial phases in one dimension, and in higher dimensions in the setting of the higher dimensional van der Corput's lemma of Carbery-Christ-Wright.