We obtain asymptotic resolvent expansions at the threshold of the essential spectrum for magnetic Schr & ouml;dinger and Pauli operators in dimension three. These operators are treated as perturbations of the Laplace operator in L-2(R-3) and L-2(R-3;C-2), respectively. The main novelty of our approach is to show that the relative perturbations, which are first order differential operators, can be factorized in suitably chosen auxiliary spaces. This allows us to derive the desired asymptotic expansions of the resolvents around zero. We then calculate their leading and sub-leading terms explicitly. Analogous factorization schemes for more general perturbations, including e.g. finite rank perturbations, are discussed as well.
Resolvent expansions of 3D magnetic Schrödinger operators and Pauli operators
Kovarik, Hynek
2024-01-01
Abstract
We obtain asymptotic resolvent expansions at the threshold of the essential spectrum for magnetic Schr & ouml;dinger and Pauli operators in dimension three. These operators are treated as perturbations of the Laplace operator in L-2(R-3) and L-2(R-3;C-2), respectively. The main novelty of our approach is to show that the relative perturbations, which are first order differential operators, can be factorized in suitably chosen auxiliary spaces. This allows us to derive the desired asymptotic expansions of the resolvents around zero. We then calculate their leading and sub-leading terms explicitly. Analogous factorization schemes for more general perturbations, including e.g. finite rank perturbations, are discussed as well.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
