Galaxy Distributions and Tsallis Statistical Mechanics
  Large-scale astrophysical systems are non-extensive due to their long-range force of gravity. Here we show an approach toward the statistical mechanics of such self-gravitating systems (SGS). This is a generalization of the standard statistical mechanics based on the new definition of entropy; Tsallis statistical mechanics. Developing the composition of entropy and the generalized Euler relation, we investigate the galaxy distributions in count-in-cell method. This is applied to the data of CfA II South redshift survey. 
Akika Nakamichi, Izumi Joichi, Osamu Iguchi, and Masahiro Morikawa