MG15 - Talk detail

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This year marks the jubilee of the discovery of neutron stars. Another discovery of the same caliber happened only last year: the detection of two neutron stars colliding in a spectacular outburst of waves and matter, ushering us in the era of multi-messenger gravitational wave astronomy. We present work in progress to craft two numerical tools that will contribute to the calculation of improved gravitational waveforms and their electromagnetic counterparts: (I) the Hyperbolic Solver for Initial Data (HyperSolID) code; and (II) the General Relativistic Force-Free Electrodynamics (GiRaFFE) code. HyperSolID numerically solves the Hamiltonian and momentum equations using the new hyperbolic approach to initial data for curved spacetimes, and it has the potential to suppress junk radiation in the initial data for compact binaries (see arxiv:1502.06884). GiRaFFE solves numerically the Einstein and Maxwell equations in the force-free magnetohydrodynamics approximation, to model the magnetospheres surrounding compact binaries, in order to characterise the nonlinear interaction between the source and its surrounding magnetosphere, and to evaluate the electromagnetic counterparts to gravitational waves, including the production of collimated jets (see arXiv:1704.00599). This work will help with the identification and extraction of new physics about the sources of the detected signals.

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