  Energy momentum tensor of a conformally coupled quantum scalar field in five
dimensional warped cosmological spacetimes is studied. We look at situations
where the four dimensional part represents a cosmological thick brane and the
scale of the extra dimension is time dependent. Renormalization of the
components of the energy momentum tensor is achieved using adiabatic
regularization method. The resulting energy and pressure densities explicitly
show the effects of warping and the dynamic extra dimension on the created
matter. We discussed how the created matter may accumulate to form thick branes
along the extra dimension.
