In a classically scale-invariant quantum field theory, tunneling rates are infrared divergent due to the existence of instantons of any size. While one expects such divergences to be resolved by quantum effects, it has been unclear how higher-loop corrections can resolve a problem appearing already at one loop. With a careful power counting, graduate student Anders Andreassen, 2017 Harvard PhD William Frost, and Prof. Matthew Schwartz uncover a series of loop contributions that dominate...