Dissertation
Survey of finite-temperature, nuclear-theory based Equations of State in Black Hole-Neutron Star Mergers
Doctor of Philosophy (PhD), Washington State University
01/2017
Handle:
https://hdl.handle.net/2376/111818
Abstract
Neutron star-black hole binaries are one of the primary sources of
gravitational waves.
These systems can also produce high-powered,
bright electromagnetic counterparts via short-duration gamma
ray bursts and kilonovae, the latter of which is powered by the production
of heavy r-process elements.
We consider systems where we assume the same initial black hole mass
and spin for all simulations, varying the equation of state of the neutron
star companion.
We use three finite-temperature, composition-dependent, nuclear-theory based
equations of state (SFHo, DD2, FSU2.1) and assume neutron star masses
in the range $1.2 - 1.4 M_\\odot$.
We show that ejecta masses mostly agree with predictions fit from simpler
equations of state, although not all, while the ejecta velocities do agree with the
updated fitting-formula.
We also determine that the dynamics of bound matter may be of particular future interest,
where the bound tail material (fallback) and the early-stage circularization
of fluid near the horizon (protodisk) admixture is highly energetic and
optically bright in neutrinos.
This distinction could be important in understanding the origins of
gamma ray bursts.
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Details
- Title
- Survey of finite-temperature, nuclear-theory based Equations of State in Black Hole-Neutron Star Mergers
- Creators
- Wyatt Andrew Brege
- Contributors
- Matthew Duez (Advisor)Sukanta Bose (Committee Member)Michael Forbes (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Department of Physics and Astronomy
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 93
- Identifiers
- 99900581627101842
- Language
- English
- Resource Type
- Dissertation