Analytically includes gravitational (Coleman-De Luccia-type) corrections to the electroweak vacuum-decay rate, refining the metastability boundary on the top/Higgs masses and showing the best-fit SM parameters sit close to the metastable region; also discusses how small black holes or other localized high-curvature objects could in principle seed bubble nucleation. relevance_note: the paper that most directly engages the “could a locally created black hole or high-energy-density blob seed vacuum decay” question — an explicit collider-adjacent soft spot in the metastability argument.