  The dynamics of an expanding hadron fluid at temperatures below the chiral
transition is studied in the framework of AdS/CFT correspondence. We establish
a correspondence between the asymptotic AdS geometry in the 4+1-dimensional
bulk with the analog spacetime geometry on its 3+1 dimensional boundary with
the background fluid undergoing a spherical Bjorken type expansion. The analog
metric tensor on the boundary depends locally on the soft pion dispersion
relation and the four-velocity of the fluid. The AdS/CFT correspondence
provides a relation between the pion velocity and the critical temperature of
the chiral phase transition.
