  We study the construction of holographic models with closed FRW cosmologies
on the worldvolume of a constant-tension brane inside a Schwarzschild-AdS black
hole. In dimensions d>2, having a smooth Euclidean solution where the brane
does not self-intersect limits the brane tension to T<T_*, preventing us from
realising a separation of scales between the brane and bulk curvature scales.
We show that adding interface branes to this model does not relax the condition
on the brane tension.
