2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/108488This work studies heat transport of bond-disordered spin-1/2 chains. As an example, the XX case is analyzed, which corresponds to a model of noninteracting spinless fermions. Within the fermion representation, the single-particle eigenenergies are determined numerically, which allow one to compute transport coefficients. Since the ballistic transport properties of a clean chain are destroyed by disorder, the focus is on the frequency dependence of the thermal conductivity and on a qualitative comparison with the spin conductivity, both at finite temperatures.2 pages, 1 figure. To be published in the Proceedings of SCES '05, Vienna, in Physica BStrongly Correlated Electronstext