General relativistic force-free electrodynamics with a discontinuous Galerkin-finite difference hybrid method

Kim, Yoonsoo; Most, Elias R.; Throwe, William; Teukolsky, Saul A.; Deppe, Nils

doi:10.1103/physrevd.109.123019

Phys. Rev. D

2024

DOI: 10.1103/physrevd.109.123019

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General relativistic force-free electrodynamics with a discontinuous Galerkin-finite difference hybrid method

Yoonsoo Kim,

Elias R. Most,

William Throwe

et al.

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2024

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Nonlinear Alfvén-wave Dynamics and Premerger Emission from Crustal Oscillations in Neutron Star Mergers

Most,

Kim,

Chatziioannou

et al. 2024

ApJL

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Neutron stars have solid crusts threaded by strong magnetic fields. Perturbations in the crust can excite nonradial oscillations, which can in turn launch Alfvén waves into the magnetosphere. In the case of a compact binary close to merger involving at least one neutron star, this can happen through tidal interactions causing resonant excitations that shatter the neutron star crust. We present the first numerical study that elucidates the dynamics of Alfvén waves launched in a compact binary magnetosphere. We seed a magnetic field perturbation on the neutron star crust, which we then evolve in fully general-relativistic force-free electrodynamics using a GPU-based implementation. We show that Alfvén waves steepen nonlinearly before reaching the orbital light cylinder, form flares, and dissipate energy in a transient current sheet. Our results predict radio and X-ray precursor emission from this process.

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Nonlinear Alfvén-wave Dynamics and Premerger Emission from Crustal Oscillations in Neutron Star Mergers

Most,

Kim,

Chatziioannou

et al. 2024

ApJL

View full text Add to dashboard Cite

show abstract

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General relativistic force-free electrodynamics with a discontinuous Galerkin-finite difference hybrid method

Cited by 1 publication

References 108 publications

Nonlinear Alfvén-wave Dynamics and Premerger Emission from Crustal Oscillations in Neutron Star Mergers

Nonlinear Alfvén-wave Dynamics and Premerger Emission from Crustal Oscillations in Neutron Star Mergers

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