  Triviality of $\phi^4$ theory in four dimensions can be avoided if the bare
coupling constant is negative in the UV. Theories with negative coupling can be
put on the lattice if the integration domain for $\phi(x)$ is contour-deformed
from the real to the complex domain. In 0+1d (quantum mechanics), one can
recover results from $\mathcal{PT}$-symmetric quantum mechanics in this way. In
this work, I report on an attempt to put negative coupling $\phi^4$ theory in 4
dimensions on the lattice.
