On sensitivity of uniform mixing times
  We show that the order of the $L_{\infty}$-mixing time of simple random walks on a sequence of uniformly bounded degree graphs of size $n$ may increase by an optimal factor of $\Theta( \log \log n)$ as a result of a bounded perturbation of the edge weights. This answers a question and a conjecture of Kozma. 
Jonathan Hermon
math.PR