Abstract
The merger of black hole (BH)–neutron star (NS) binaries will give us a unique opportunity to explore many aspects of unknown physics in the near future. Gravitational waves from the merger of such binaries will tell us invaluable information of the NS properties, especially of the equation of state (EOS) at nuclear and supranuclear density. In particular, the EOS strongly modifies the gravitational waveform when the NS is tidally disrupted by the tidal force field of the BH before they merge.
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Notes
- 1.
For the merger of binary NSs, a frequent outcome will not be a BH, but be a hypermassive NS [21–23]. If the hypermassive NS is formed, gravitational waves just after the merger are not emitted by the BH ringdown, but by oscillation of the hypermassive NS. We do not go into detail of the hypermassive NS, because it is not relevant to the BH–NS binary. It should be noted that gravitational waves from hypermassive NSs will tell us information at higher density than at the central density of a canonical NS.
- 2.
\(G=6.67 \times 10^{-8}\,\mathrm{{g}}^{-1}\,\mathrm{{cm}}^3\,\mathrm{{s}}^{-2}, c=3.00 \times 10^{10}\,\mathrm{cm}\,\mathrm{{s}}^{-1}\).
- 3.
The existence of intermediate GRBs is also suggested by several observations, but is not conclusive.
- 4.
We neglect the effect of the cosmological redshift for simplicity. This simplification does not change the conclusion, particularly for short-hard GRBs.
- 5.
For a short-hard GRB, it is suggested that the opacity of \(e^- e^+\) pair production from two photons itself gives a weaker constraint compared to the case of a long GRB [39].
- 6.
The possibility of a stable mass transfer is also suggested [56]. The stable mass transfer occurs if the orbital separation increases faster than the NS radius increases when the mass is tidally stripped from the NS (lighter component) to the BH (heavier component). We do not discuss the stable mass transfer in more detail, because it has never been observed in numerical-relativity simulations. The reason for this may be that the stable mass transfer requires a large mass ratio, whereas the mass shedding requires a small mass ratio especially in full general relativity [57]. It does not exclude the stable mass transfer for a BH–NS binary with a massive and rapidly-spinning BH.
- 7.
We essentially compare the mass density of each object.
- 8.
In this thesis, “the ISCO radius” always represents “the ISCO radius in the Boyer-Lindquist coordinates,” which is physical in the sense that it gives the proper circumferential length for the equatorial circular orbit. It should be noted that the coordinate radius of the ISCO in numerical-relativity simulation is different from the Boyer-Lindquist one.
- 9.
Currently, there is no consistent method to compute quasiequilibrium states of magnetized compact binaries. The simulation for a magnetized compact binary is performed by superposing a magnetic field on a nonmagnetized initial condition, more or less artificially.
- 10.
- 11.
In this thesis, “prograde” and “retrograde” spins mean the BH spins which are aligned and antialigned with the orbital angular momentum of the binary, respectively.
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Kyutoku, K. (2013). Introduction. In: The Black Hole-Neutron Star Binary Merger in Full General Relativity. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-54201-8_1
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