Examples of nonpolygonal limit shapes in i.i.d. first-passage percolation and infinite coexistence in spatial growth models

Michael Damron, Michael Hochman
2013 The Annals of Applied Probability  
We construct an edge-weight distribution for i.i.d. first-passage percolation on Z^2 whose limit shape is not a polygon and whose extreme points are arbitrarily dense in the boundary. Consequently, the associated Richardson-type growth model can support coexistence of a countably infinite number of distinct species, and the graph of infection has infinitely many ends.
doi:10.1214/12-aap864 fatcat:mjwxxnkpxvcezjloweklwkvamy