Erlangen 2026 – scientific programme

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GR: Fachverband Gravitation, Relativistische Astrophysik und Kosmologie

GR 5: Relativistic Astrophysics I

GR 5.1: Talk

Tuesday, March 17, 2026, 16:15–16:30, KH 01.016

Magnetic field instabilities and late-time equilibria in isolated neutron stars — •Aurora Capobianco — Theoretisch-Physikalisches Institut, Friedrich-Schiller-Universität Jena, 07743, Jena, Germany

The late-time equilibrium geometry of magnetic fields in neutron stars remains poorly constrained, despite its importance for observable signatures. We investigate the development and long-term evolution of strong magnetic fields in isolated neutron stars using the general relativistic magnetohydrodynamics (GRMHD) code AthenaK. Our simulations follow the full general-relativistic evolution of neutron stars with an external dipole-like field and a range of initial internal magnetic-field configurations. We focus on the symmetry properties, stability, and equilibrium structure of the resulting magnetic-field. In particular, we examine the onset and nonlinear evolution of magnetic-field instabilities and assess their role in redistributing magnetic energy. We also discuss the implications of these dynamics for the gravitational-wave emission produced.

Keywords: Magnetic fields; Neutron stars; General Relativistic Magnetohydrodynamics