2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/190816We study the heat kernel for an operator of Laplace type with a $δ$-function potential concentrated on a closed surface. We derive the general form of the small $t$ asymptotics and calculate explicitly several first heat kernel coefficients.16 pagesHigh Energy Physics - Theorytext