Comparison principle for stochastic heat equations driven by $α$-stable white noises

Abstract: For a class of non-linear stochastic heat equations driven by $\alpha$-stable white noises for $\alpha\in(1,2)$ with Lipschitz coefficients, we first show the existence and pathwise uniqueness of $L^p$-valued c`{a}dl`{a}g solutions to such a equation for $p\in(\alpha,2]$ by considering a sequence of approximating stochastic heat equations driven by truncated $\alpha$-stable white noises obtained by removing the big jumps from the original $\alpha$-stable white noises. If the $\alpha$-stable white noise is spectrally one-sided, under additional monotonicity assumption on noise coefficients, we prove a comparison theorem on the $L^2$-valued c`{a}dl`{a}g solutions of such a equation. As a consequence, the non-negativity of the $L^2$-valued c`{a}dl`{a}g solution is established for the above stochastic heat equation with non-negative initial function.