Dissertation
General relativistic magnetohydrodynamics: Code development and simulation of magnetized post-merger torus
Doctor of Philosophy (PhD), Washington State University
01/2016
Handle:
https://hdl.handle.net/2376/111859
Abstract
Magnetic fields play important roles in many astrophysical phenomena. Among all interesting astrophysical objects, for both numerical and observational studies, magnetized compact binary mergers are very special. Black hole-neutron star (BHNS) and neutron star-neutron star (NSNS) mergers have extremely curved space-time and dense magnetized fluid, which makes them good sources of relativistic jets, gravitational waves, magnetic driven turbulence and neutrino interactions. The existence of all this physics in a single compact merger makes it an excellent candidate for describing short gamma ray bursts (GRB).
In order to study magnetized relativistic objects, one needs a robust code to numerically solve the Einstein equations and the general relativistic magnetohydrodynamic (GRMHD) equations in three dimensions. In this thesis I present the following projects; a) The implementation of our GRMHD module in Spectral Einstein Code (SpEC) and the results of one and two-dimensional magnetohydrodynamic tests to show the accuracy of our code. b) 3D simulations of a differentially rotating magnetized neutron star to study the effects of magnetic field on the low T/W instability. Though strong toroidal fields were predicted to suppress the low-T/|W| instability, we find that they do so only in a small range of field strengths. We find strong enough magnetic field creates magnetic instabilities, which can actually amplify global quadrupole modes. c) 3D simulations of a magnetized neutrino-cooled BHNS post merger accretion disk, to study the effects of magnetic winding and magnetorotational instability (MRI) on the disk structure, thermal equilibrium, neutrino emissions and possible magnetic driven winds and outflows.
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Details
- Title
- General relativistic magnetohydrodynamics: Code development and simulation of magnetized post-merger torus
- Creators
- Fatemeh Hossein-Nouri
- Contributors
- Matthew D Duez (Advisor)Sukanta Bose (Committee Member)Nicholas Cerruti (Committee Member)Guy Worthey (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Physics and Astronomy, Department of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 146
- Identifiers
- 99900581723101842
- Language
- English
- Resource Type
- Dissertation