Short-time heat content asymptotics via the wave and eikonal equations

Abstract

In this short paper, we derive an alternative proof for some known [van den Berg & Gilkey 2015] short-time asymptotics of the heat content in compact full-dimensional submanifolds $S$ with smooth boundary. This includes formulae like \begin{equation*} \int_{S} \exp(tΔ)\left( f \mathbb 1_S\right)\, \mathrm{d}x = \int_S f \,\mathrm{d}x - \sqrt{\frac{t}π} \int_{\partial S} f \,\mathrm{d}A + o(\sqrt t),\quad t \rightarrow 0\,. \end{equation*} and (partially new) explicit expressions for similar expansions involving other powers of $\sqrt{t}$. By the same method, we also obtain short-time asymptotics of ${\int }_S\exp (t^m{\Delta }^m)\left(f{1}_S\right)\mathrm{d}x$, $m\in \mathbb{N}$, and more generally for one-parameter families of operators $t\mapsto k(\sqrt{-t\Delta })$ defined by an even Schwartz function $k$.

References in corpus (1)

• Characterizations of sets of finite perimeter using heat kernels in metric spaces