%0 Journal Article %T Remarks about Hardy inequalities on metric trees %A Tomas Ekholm %A Rupert L. Frank %A Hynek Kovarik %J Mathematics %D 2007 %I arXiv %X We find sharp conditions on the growth of a rooted regular metric tree such that the Neumann Laplacian on the tree satisfies a Hardy inequality. In particular, we consider homogeneous metric trees. Moreover, we show that a non-trivial Aharonov-Bohm magnetic field leads to a Hardy inequality on a loop graph. %U http://arxiv.org/abs/0711.1943v1