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Multiple phase transitions in long-range first-passage percolation on square lattices

We consider a model of long-range first-passage percolation on the $d$ dimensional square lattice $Z^d$ in which any two distinct vertices $x, y \in Z^d$ are connected by an edge having exponentially distributed passage time with mean $||x-y||^{α+o(1)}$, where $α>0$ is a fixed parameter and $||\cdot||$ is the $\ell_1$-norm on $Z^d$. We analyze the asymptotic growth rate of the set $B_t$, which consists of all $x \in Z^d$ such that the first-passage time between the origin 0 and $x$ is at most $t$, as $t\to\infty$. We show that depending on the values of $α$ there are four growth regimes: (i) instantaneous growth for $α<d$, (ii) stretched exponential growth for $α\in (d,2d)$, (iii) superlinear growth for $α\in (2d,2d+1)$ and finally (iv) linear growth for $α>2d+1$ like the nearest-neighbor first-passage percolation model corresponding to $α=\infty$.