6 research outputs found
Curvature stabilized skyrmions with angular momentum
We examine skyrmionic field configurations on a spherical ferromagnet with
large normal anisotropy. Exploiting variational concepts of angular momentum we
find a new family of localized solutions to the Landau-Lifshitz equation that
are topologically distinct from the ground state and not equivariant.
Significantly, we observe an emergent spin-orbit coupling on the level of
magnetization dynamics in a simple system without individual rotational
invariance in spin and coordinate space
Near Resonant Approximation of the Rotating Stratified Boussinesq system on a 3-Torus
Based on a novel treatment of near resonances, we introduce a new
approximation for the rotating stratified Boussinesq system on
three-dimensional tori with arbitrary aspect ratios. The rotation and
stratification parameters are arbitrary and not equal. We obtain global
existence for the proposed nonlinear system for arbitrarily large initial data.
This system is sufficiently accurate, with an important feature of coupling
effects between slow and fast modes. The key to global existence is a sharp
counting of the relevant number of nonlinear interactions. An additional
regularity advantage arises from a careful examination of some mixed type
interaction coefficients. In a wider context, the significance of our near
resonant approach is a delicate balance between the inclusion of more
interacting modes and the improvement of regularity properties, compared to the
well-studied singular limit approach based on exact resonance