2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/38895We present a numerical study using a cluster algorithm for the 1-d $S=1/2$ quantum Heisenberg models. The dynamical critical exponent for anti-ferromagnetic chains is $z=0.0(1)$ such that critical slowing down is eliminated.contribution to the Amsterdam Lattice '92 conference, 4 pages, figures not included, stylefile espcrc2.sty required, BUTP-92/33High Energy Physics - Latticetext