Lp -L 2 estimates for solutions of the wave equation associated to the Grushin operator

This article deals with L-p-L-2 estimates for solutions of the wave equation associated to the Grushin operator G := -Delta - vertical bar x vertical bar(2) partial derivative(2)/partial derivative t(2) on Rn+1. We make use of the L-p boundedness of Riesz transforms for the Grushin operator in studying the wave equatio