SPINNING FLUIDS IN THE EINSTEIN-CARTAN-THEORY - A VARIATIONAL FORMULATION

In this work we propose a lagrangian for spinning fluids in the Einste in-Cartan theory. The basic characteristic of the model is to consider each infinitesimal volume element as replicas of micro-rigid bodies. The theory obtained represents the thermodynamical equilibrium limit o f a more general situation where dissipative processes due to spin tak e place. We outline the extension of such processes to the Einstein-Ca rtan theory.