How do multi streaming regions form and evolve?



In cosmology, multi-streaming regions are characterized by a high density of particles with large velocity magnitude or direction differences, or both.  There is a number of potential identifiers for multi-streaming regions such as high velocity variance, high shear, sink-like behavior or high tendency to spin.  The multi-streaming events are interesting to scientists because they are  associated with the formation of large scale structures such as halo clusters, 
filaments and voids. The ability to find and track these events will help understanding the evolution of the Universe in more detail.

In this talk, we present our preliminary findings on the evolution of  multi-streaming regions. We hypothesize that more than one type of multi-streaming regions exists: those that grow from smaller scale structures and tend to exist for  extended periods, and those that appear briefly, as a result of two or more smaller  clusters passing in close proximity to each other.