Sharp Capacity Estimates and Volume Growth for Fractional Sobolev Spaces

We obtain sharp two-sided estimates for the relative capacity of fat and thin annuli in the fractional Sobolev spaces $W^s_{p,q}$, where $s\in(0,1)$, $p\in(0,\infty)$, $q\in(0,\infty]$, in terms of an explicit volume growth quantity. The underlying space is a general metric measure space equipped