  We present recent results on the asymptotics of a brane-world that consists
of a flat 3-brane embedded in a five-dimensional bulk. The bulk matter is
modelled by a fluid that satisfies a nonlinear equation of state. We show that
for appropriate ranges of the equation of state parameters, it is possible to
construct a regular solution, compatible with energy conditions, that
successfully localizes gravity on the brane. These results improve
significantly previous findings on the study of a bulk fluid with a linear
equation of state.
