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\item In \citet{http://adsabs.harvard.edu/abs/2013PhRvE..87d2723R} page 5, it is claimed that motion will be a superposition of longitudinal and transverse. Is this true -- won't one of them be unstable (in the case where work done in dragging is less than $T$, say)?  \item Same paper, page -- dimensional analysis. Try to do a better job than scaling argument: what are the coefficients? The fact that in the other paper they are off by some distance might be to do with this.   \begin{itemize}   \item I think $t_{\rm h}\sim \ell/c_{\rm s}$ on physical grounds, but Payam says $t_{\rm h}\sim \ell^2\rho/\eta$ from dimensional analysis. Are these compatible?   \item Payam has (equation 12) $v_{\rm DNA}=F_{\rm ext} \ln(\ell/d}/\eta\ell - \lambdaE\ln(1+r_{\rm D}/d}/\eta$, which we use to calculate $t_{\rm D}$. He finds $t_{\rm D}\sim \ell\eta/E\lambda$ -- whence  this kind of thing. simplification?   \end{itemize}  \item Where does the {\it nonequilibrium} stuff happen? There is no mention of linear response or anything like that.  \end{enumerate}