Manipulation of cold atomic collisions by cavity QED effects

We show how the dynamics of collisions between cold atoms can be manipulate d by a modification of spontaneous emission times. This is achieved by plac ing the atomic sample in a resonant optical cavity. Spontaneous emission is enhanced by a combination of multiparticle entanglement together with a hi gher density of modes of the modified vacuum field, in a situation akin to superradiance. A specific situation is considered and we show that this eff ect can be experimentally observed as a large suppression in trap-loss rate s.