2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/128283We study Fourier multipliers which result from modulating jumps of Lévy processes. Using the theory of martingale transforms we prove that these operators are bounded in $L^p(\Rd)$ for $1<p<\infty$ and we obtain the same explicit bound for their norm as the one known for the second order Riesz transforms.18 pagesFunctional AnalysisProbability42B15; 60G51text