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GR: Fachverband Gravitation und Relativitätstheorie
GR 9: Numerische Relativitätstheorie I
GR 9.7: Talk
Wednesday, February 27, 2013, 15:30–15:45, HS 6
Modeling neutron stars using a GR Resistive MHD formalism — •Daniela Alic1, Kyriaki Dionysopoulou1, Carlos Palenzuela2, Luciano Rezzolla1, and Bruno Giacomazzo3 — 1Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Potsdam-Golm, Germany — 2Canadian Institute for Theoretical Astrophysics, Toronto, Canada — 3JILA, University of Colorado and National Institute of Standards and Technology, Boulder, USA
We present numerical results obtained with a general-relativistic resistive magnetohydrodynamics (GR-RMHD) version of the Whisky code, using an algebraic Ohm law that accounts for the effects of finite resistivity. The numerical method adopted exploits the properties of Implicit-Explicit Runge-Kutta (RKIMEX) numerical schemes to treat the stiff terms of the equations. We report simulations of magnetized neutron stars both in the Cowling approximation and in dynamical spacetimes. In addition, we present the case of a collapsing star, which provides a very good testbed for numerical codes with dynamical electromagnetic fields in strong gravity and has interesting astrophysical implications. Finally, we show that our results are in good agreement with the perturbative studies of the dynamics of electromagnetic fields in a Schwarzschild background.