Circular average relative to fractal measures

We prove new $L^p$- $L^q$ estimates for averages over dilates of the circle with respect to $α$-dimensional fractal measure, which unify different types of maximal estimates for the circular average. Our results are consequences of $L^p$- $L^q$ smoothing estimates for the wave operator relative to fractal measures. We also discuss similar results concerning the spherical averages.

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