Holographic equation of state in fluid/gravity duality
  We establish a precise relation between mixed boundary conditions for scalar
fields in asymptotically anti de Sitter spacetimes and the equation of state of
the dual fluid. We provide a detailed derivation of the relation in the case of
five bulk-dimensions for scalar fields saturating the Breitenlohner-Freedman
bound. As a concrete example, we discuss the five dimensional scalar-tensor
theories describing a constant speed of sound.
