Halo Shapes and their Relation to Environment
  Using high resolution DM simulations we study the shape of dark matter halos. Halos become more spherical with decreasing mass. This trend is even more pronounced for the inner part of the halo. Angular momentum and shape are correlated. The angular momenta of neighboring halos are correlated. 
Stefan Gottloeber (1), Victor Turchaninov (2) ((1) AIP, (2) Keldysh   Institute)