Spectral Heat Content for L\'evy Processes

In this paper we study the spectral heat content for various L'evy processes. We establish the asymptotic behavior of the spectral heat content for L'{e}vy processes of bounded variation in ${\mathbb{R}}^d$, $d\ge 1$. We also study the spectral heat content for arbitrary open sets of finite Lebesgue measure in $\mathbb{R}$ with respect to L'{e}vy processes of unbounded variation under certain conditions on their characteristic exponents. Finally we establish that the asymptotic behavior of the spectral heat content is stable under integrable perturbations to the L'{e}vy measure.