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We look at the possibility of non-perturbative particle production afterinflation from SUSY flat directions produced by rotating eigenstates therebyavoiding the standard adiabaticity conditions. This might lead to preheatingand prevent the delay of thermalisation of the universe. We investigate theflat directions $LLE^c$ and $U^cD^cD^c$ and find no particle production. These2 directions are very important, since they have been named as possiblecandidates for being the inflaton. We investigate $QLQLQLE^c$ and find particleproduction and therefore the possibility of preheating. We investigate the$LLE^c$ and $U^cD^cD^c$ directions appearing simultaneously, and find noproduction. Finally, we investigate $LLE^c$ and $QLD^c$ simultaneously - withone L-field in common. Here we do find particle production and therefore thepossibility of preheating. This means that if SUSY flat directions are to delaythermalisation and thus explain the (lack of) gravitino production, it isnecessary to explain why complicated directions as $QLQLQLE^c$ are not exited,and why combinations like $LLE^c$ and $QLD^c$ are not both exited.

SUSY Flat Direction Decay - the prospect of particle production and preheating investigated in the unitary gauge