  We study thermal transitions in a Domain Wall AdS/QCD model. The model is
based on the D5/probe D7 system with a discontinuous mass profile which
restricts chiral fermions to 3+1 dimensional domain walls. Fluctuations on the
domain wall are dual to the quark mass and condensate and reveal the relation
between domain wall separation and the quark mass. The massive quarks exhibit a
second order thermal, meson melting transition. Witten's multi-trace
prescription can be used to interpret these configurations as having a
dynamical mass from a Nambu-Jona-Lasinio interaction - here the transition is
first order. Confinement can be introduced into the gauge sector by
compactifying one direction of the D5. Compactification induces chiral symmetry
breaking and there is a first order thermal restoration transition. If an NJL
interaction is also introduced then the confinement and chiral symmetry
breaking scales can be separated.
