Potential operators associated with Hankel and Hankel-Dunkl transforms
  We study Riesz and Bessel potentials in the settings of Hankel transform, modified Hankel transform and Hankel-Dunkl transform. We prove sharp or qualitatively sharp pointwise estimates of the corresponding potential kernels. Then we characterize those $1\le p,q \le \infty$, for which the potential operators satisfy $L^p-L^q$ estimates. In case of the Riesz potentials, we also characterize those $1\le p,q \le \infty$, for which two-weight $L^p-L^q$ estimates, with power weights involved, hold. As a special case of our results, we obtain a full characterization of two power-weight $L^p-L^q$ bounds for the classical Riesz potentials in the radial case. This complements an old result of Rubin and its recent reinvestigations by De N\'apoli, Drelichman and Dur\'an, and Duoandikoetxea. 
Adam Nowak, Krzysztof Stempak
math.CA