Well-posedness and large deviations for the stochastic Landau Lifshitz Bloch equation

Abstract: The stochastic Landau-Lifshitz-Bloch equation in dimensions 1; 2; and 3 perturbed by pure jump noise is considered in the Marcus canonical form. A proof for existence of a martingale solution is given. The proof uses the Faedo-Galerkin approximation; which is followed by compactness and tightness arguments. This is followed by use of the Jakubowski's version of the Skorohod Theorem. Pathwise uniqueness and the theory of Yamada and Watanabe give the existence of a strong solution for dimensions 1 and 2. A weak convergence method is later used to establish a Wentzell-Freidlin type large deviation principle for the small noise asymptotic of solutions for dimensions 1 and 2.