Traveling wave solutions for bistable fractional Allen-Cahn equations with a pyramidal front

Using the method of sub-super-solution, we construct a solution of $(-\mathrm{\Delta }{)}^{s}u-c{u}_z-f(u)=0$ on ${\mathbb{R}}^3$ of pyramidal shape. Here $(-\mathrm{\Delta }{)}^s$ is the fractional Laplacian of sub-critical order $1\mathrm{/}2<s<1$ and $f$ is a bistable nonlinearity. Hence, the existence of a traveling wave solution for the parabolic fractional Allen-Cahn equation with pyramidal front is asserted. The maximum of planar traveling wave solutions in various directions gives a sub-solution. A super-solution is roughly defined as the one-dimensional profile composed with the signed distance to a rescaled mollified pyramid. In the main estimate we use an expansion of the fractional Laplacian in the Fermi coordinates.