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\subsection{clustering} \section{Jeremie: Clustering}  Read \cite{http://adsabs.harvard.edu/abs/2012PhRvL.108z8303T} and others.  Want to understand how clusters form, why they are dynamic, what is the probability of breaking / re-forming, what is the size distribution. Can do this statistically or mechanically.  Solve (coupled) diffusion equation as a first mean field approximation.