Dynamical Magnetic Susceptibility for the $t$-$J$ Model
  We present results for the {\em dynamical}\/ magnetic susceptibility of the $t$-$J$ model, calculated with the dynamical mean field theory. For $J=0$ we find enhanced ferromagnetic correlations but an otherwise relatively $\vec{q}$-independent dynamical magnetic susceptibility. For $J>0$ the explicit antiferromagnetic exchange leads to a dynamic spin structure factor with the expected peak at the antiferromagnetic Bragg point. 
Th. Pruschke, Th. Obermeier and J. Keller (Institut f\"ur   Festk\"orperphysik, Universit\"at Regensburg, Germany)