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Notes to myself about various things to read.  \begin{itemize}  \item Bertin 2009 \url{http://perso.ens-lyon.fr/eric.bertin/lecture_notes2009.pdf}. Section 2.5 on disordered systems.  \item \cite{http://adsabs.harvard.edu/abs/2009arXiv0901.1271K} \cite{2009arXiv0901.1271K}  \item Kurchan 1998 Fluctuation Theorem  \item \citet{http://adsabs.harvard.edu/abs/2009PhRvL.102p0601B} \citet{2009PhRvL.102p0601B}  \end{itemize}  Miscellaneous stuff.  \begin{itemize}  \item Renormalisation group good for things with structure, where correlations between sites are important. Could be good for CLUSTERING investigation, especially if I can write down a Hamiltonian for the whole system composed of other particles (will certainly have to simplify this a lot!).  \item In Langevin analysis (e.g. \citet{http://adsabs.harvard.edu/abs/1975JFM....72..499H}) \citet{1975JFM....72..499H})  we define inertia and friction tensors $\mathbf{m}$ and $\mathbf\zeta$, which act on the system's state vector $\mathbf x$. What does it mean when these are symmetrical? When they are diagonal? \end{itemize}