Stellar collisions, binaries, core collapse
I finished reading an introduction to stellar collisions, the formation and effects of binaries, and core collapse. The topics are interrelated and must be included in a good galaxy simulation. The problem is that properly modeling the interactions between stars while simultaneously modeling the global galaxy evolution is very computationally expensive. However it is necessary if the formation and growth of black holes in the nuclei of galaxies and globular clusters is to be consistently modeled.