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arXiv · 1509.09205

Efficient magnetic-field amplification due to the Kelvin-Helmholtz instability in binary neutron star mergers

Kenta Kiuchi·Pablo Cerdá-Durán·Koutarou Kyutoku·Yuichiro Sekiguchi·Masaru Shibata
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Abstract

We explore magnetic-field amplification due to the Kelvin-Helmholtz instability during binary neutron star mergers. By performing high-resolution general relativistic magnetohydrodynamics simulations with a resolution of $17.5$ m for $4$--$5$ ms after the onset of the merger on the Japanese supercomputer "K", we find that an initial magnetic field of moderate maximum strength $10^{13}$ G is amplified at least by a factor of $\approx 10^3$. We also explore the saturation of the magnetic-field energy and our result shows that it is likely to be $\gtrsim 4 \times 10^{50}$ erg, which is $\gtrsim 0.1\%$ of the bulk kinetic energy of the merging binary neutron stars.

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Kenta Kiuchi, Pablo Cerdá-Durán, Koutarou Kyutoku, Yuichiro Sekiguchi, Masaru Shibata. 2015-11-13. Efficient magnetic-field amplification due to the Kelvin-Helmholtz instability in binary neutron star mergers. https://doi.org/10.1103/physrevd.92.124034

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