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- W2084328608 abstract "We present long-term ($ensuremath{sim}{10}^{4}M$) axisymmetric simulations of differentially rotating, magnetized neutron stars in the slow-rotation, weak magnetic field limit using a perturbative metric evolution technique. Although this approach yields results comparable to those obtained via nonperturbative (BSSN) evolution techniques, simulations performed with the perturbative metric solver require about $1/4$ the computational resources at a given resolution. This computational efficiency enables us to observe and analyze the effects of magnetic braking and the magnetorotational instability (MRI) at very high resolution. Our simulations demonstrate that (1) MRI is not observed unless the fastest-growing mode wavelength is resolved by $ensuremath{gtrsim}10$ gridpoints; (2) as resolution is improved, the MRI growth rate converges, but due to the small-scale turbulent nature of MRI, the maximum growth amplitude increases, but does not exhibit convergence, even at the highest resolution; and (3) independent of resolution, magnetic braking drives the star toward uniform rotation as energy is sapped from differential rotation by winding magnetic fields." @default.
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- W2084328608 date "2006-08-28" @default.
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- W2084328608 title "General relativistic simulations of slowly and differentially rotating magnetized neutron stars" @default.
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- W2084328608 doi "https://doi.org/10.1103/physrevd.74.044030" @default.
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