Field theories for Laplacian Growth

Loop-erased random walks (LERW), the $O(n)$-model at ${n=-2}$ and Laplacian random walks (LRW) are three realizations of the same random process.

While this equivalence holds on any graph, renormalization is possible only via the $O(-2)$-model.

To generalize LRWs to $b$-LRWs or to Diffusion Limited Aggregation (DLA), a field theory directly on the Laplacian growth process is necessary.

Here we construct an exact lattice action for LRWs and show that its perturbative expansion equals that of LERWs.

We then generalize this approach to $b$-LRWs and DLA.