Weak scale inflation and unstable domain walls

Cosmological domain walls produced during phase transition are expected to collapse on a cosmologically safe timescale if Vilenkinʹs condition is satisfied. We show that the decaying processes of these unstable domain walls should be changed significantly if weak scale inflation takes place. The usual condition for the safe decay of the cosmological domain wall must be changed, depending on their scales and interactions. As a result, the energy scales and explicit breaking terms of such walls must satisfy severe requirements. We also make a brief comment on cosmological structure formation.