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The other three-dimensional brane is called the hidden brane , and we never see it.
However in this picture, the warping of the brane causes the the graviton to become bound to our brane , so that the graviton wave function falls away very rapidly away in the direction of the extra dimension.
In M theory, there are also extended objects, but they are called M branes rather than D branes .
There are branes to wrap, hierarchies to set, geometry to resolve, supersymmetry to break - a laundry list of processes and transitions that have to be described within in a string theory cosmology.
Also, string theory has motivated an understanding of black holes in higher dimensions, and of black extended objects such as strings and branes .
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