QUALITATIVE CHAOS IN GALACTIC MODELS

On the basis of the average criterion of the qualitative behaviour of the Hamiltonian dynamical systems, the significance of the anisotropy and inhomogenity assumptions is discussed. For two different approxima tions of the galaxy as a rigid body and as an N-body system we use the Ricci scalar in order to detect the degree of stochasticity. This dem onstrates that inhomogeneities in the model give a more effective mech anism of stochasticity of the system than its anisotropies.