Size, angular momentum and mass for objects
  We obtain a geometrical inequality involving the ADM mass, the angular momentum and the size of an ordinary, axially symmetric object. We use the monotonicity of the Geroch quasi-local energy on 2-surfaces along the inverse mean curvature flow. We also compute numerical examples to test the robustness of our hypotheses and results 
Pablo Anglada, M.E. Gabach-Clement, Omar E. Ortiz
gr-qc