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https://stockholmuniversity.zoom.us/j/530682073
The long-term evolution of the internal, strong magnetic fields of neutron stars needs a specific numerical modelling. The diversity of the observed phenomenology of neutron stars indicates that their magnetic topology is rather complex and three-dimensional simulations are required, for example, to explain the observed bursting mechanisms and the creation of surface hotspots. We present MATINS, a new three-dimensions numerical code for magneto-thermal evolution in isolated neutron stars, based on a finite-volume scheme that employs the cubed-sphere system of coordinates. MATINS follows the evolution of strong fields (1e14-1e15 Gauss) with complex non-axisymmetric topologies and dominant Hall-drift terms. Here, we show the first 3D fully coupled magneto-thermal simulations including the most realistic background structure and microphysical ingredients so far. Following the exploration of different initial topologies, the magnetic field keeps a strong memory of the initial large-scales, which are much harder to be restructured or created. This indicates that large-scale configuration attained during the neutron star formation is crucial to determine the field topology at any evolution stage. Thus, in our recent work we studied a complex initial topology inspired by core-collapse supernovae, where most of the energy is stored in the toroidal component and only few percent of the mean magnetic field is stored in the dipolar component. Our goal is to investigate whether the surface dipole, responsible for the dominant electromagnetic spin-down torque, will increase with time and explain the strong field inferred from the observations.