We establish Strichartz estimates (both reversed and some direct ones), pointwise decay estimates, and weighted decay estimates for the linear wave equation in dimension two with an almost scaling-critical potential, in the case when there is no resonance or eigenvalue at the edge of the spectrum. We also prove some simple nonlinear applications.
Beceanu, Marius, "Decay Estimates for the Wave Equation in Two Dimensions" (2015). Mathematics and Statistics Faculty Scholarship. 24.