  In this paper we propose a generalization of the Gilkey-de Witt heat kernel
expansion, designed to provide us with a precise estimation of the heat trace
of non-negative Schroedinger type differential operators with non-trivial
kernel over all the domain of its "inverse temperature" variable. We apply this
modified approach to compute effectively the one-loop kink mass shift for some
models whose kink fluctuation operator spectrum is unknown and the only
alternative to estimate this magnitude is the use of the heat kernel expansion
techniques.

High Energy Physics - Theory