Kaluza-Klein reduction of relativistic fluids and their gravity duals

Understand

We study the hydrodynamics of relativistic fluids with several conserved global charges (i.e., several species of particles) by performing a Kaluza-Klein dimensional reduction of a neutral fluid on a N-torus.

• Via fluid/gravity correspondence, this allows us to describe the long-wavelength dynamics of black branes with several Kaluza-Klein charges.
• We obtain the equation of state and transport coefficients of the charged fluid directly from those of the higher-dimensional neutral fluid.
• We specialize these results for the fluids dual to Kaluza-Klein black branes.