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| Paper: |
Powering Short GRBs by Mergers of Moderately Magnetized Neutron Stars |
| Volume: |
459, 6th International Conference of Numerical Modeling of Space Plasma Flows (ASTRONUM 2011) |
| Page: |
49 |
| Authors: |
Aloy, M. A.; Rezzolla, L.; Giacomazzo, B.; Obergaulinger, M. |
| Abstract: |
We explore the process of amplification of the magnetic field
initially contained in merging neutron stars on the light shed by
the recent results of global and local numerical simulations. We
show that the field growth proceeds in two regimes. First, the
initial fields are amplified in an unstable KH-shear layer, which
results when the two neutron stars touch each other. This
amplification lasts, at most, until the central black hole if
formed. Subsequently, an MRI unstable toroidal remnant amplifies
further the magnetic field. No ultrarelativistic outflow is formed
in by the action of the magnetic field, at least in the first ∼ 30 ms after the neutron stars merge, since neither the
magnetization, nor the magnetic flux across the event horizon are
large enough. However, we conclude that thermally generated
ultrarelativistic outflows, which ultimately give rise to short
gamma-ray bursts, could be generated soon after the formation of the
central BH by our models, if they would include the appropriate
neutrino physics. |
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