General relativistic simulations of magnetized binary neutron star mergers
| dc.creator | Liu, Yuk Tung | |
| dc.creator | Shapiro, Stuart L. | |
| dc.creator | Etienne, Zachariah B. | |
| dc.creator | Taniguchi, Keisuke | |
| dc.date | 2008-03-28 | |
| dc.date | 2008-07-10 | |
| dc.date.accessioned | 2026-07-07T11:33:24Z | |
| dc.date.available | 2026-07-07T11:33:24Z | |
| dc.description | Binary neutron stars (NSNS) are expected to be among the leading sources of gravitational waves observable by ground-based laser interferometers and may be the progenitors of short-hard gamma ray bursts. We present a series of general relativistic NSNS coalescence simulations both for unmagnetized and magnetized stars. We adopt quasiequilibrium initial data for circular, irrotational binaries constructed in the conformal thin-sandwich (CTS) framework. We adopt the BSSN formulation for evolving the metric and a high-resolution shock-capturing scheme to handle the magnetohydrodynamics. Our simulations of unmagnetized binaries confirm the results of Shibata, Taniguchi and Uryu (2003). In cases in which the mergers result in a prompt collapse to a black hole, we are able to use puncture gauge conditions to extend the evolution and determine the mass of the material that forms a disk. We find that the disk mass is less than 2% of the total mass in all cases studied. We then add a small poloidal magnetic field to the initial configurations and study the subsequent evolution. For cases in which the remnant is a hypermassive neutron star, we see measurable differences in both the amplitude and phase of the gravitational waveforms following the merger. For cases in which the remnant is a black hole surrounded by a disk, the disk mass and the gravitational waveforms are about the same as the unmagnetized cases. Magnetic fields substantially affect the long-term, secular evolution of a hypermassive neutron star (driving `delayed collapse') and an accretion disk around a nascent black hole. | |
| dc.description | 19 pages, 23 figures, replaced with the published version | |
| dc.identifier | https://arxiv.org/abs/0803.4193 | |
| dc.identifier | http://arxiv.org/abs/0803.4193 | |
| dc.identifier | Phys.Rev.D78:024012,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.78.024012 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/197877 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | General relativistic simulations of magnetized binary neutron star mergers | |
| dc.type | text |