Logarithmic corrections to the Alexander-Orbach conjecture for the four-dimensional uniform spanning tree

We compute the precise logarithmic corrections to Alexander-Orbach behaviour for various quantities describing the geometric and spectral properties of the four-dimensional uniform spanning tree. In particular, we prove that the volume of an intrinsic $n$-ball in the tree is $n^2(\log n{)}^{-1\mathrm{/}3+o(1)}$, that the typical intrinsic displacement of an $n$-step random walk is $n^{1\mathrm{/}3}(\log n{)}^{1\mathrm{/}9-o(1)}$, and that the $n$-step return probability of the walk decays as $n^{-2\mathrm{/}3}(\log n{)}^{1\mathrm{/}9-o(1)}$.