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Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
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Binary Neutron Star Mergers.

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This review covers binary neutron star mergers, from formation and rates to simulation techniques. It highlights advancements in understanding coalescence physics and future directions for gravitational-wave astronomy.

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Area of Science:

  • Astrophysics
  • Gravitational-wave astronomy
  • Computational physics

Background:

  • Binary neutron star systems are key sources of gravitational waves.
  • Understanding their mergers is crucial for multi-messenger astronomy.
  • Previous studies have laid the groundwork for current research.

Purpose of the Study:

  • To provide a comprehensive review of binary neutron star coalescence.
  • To discuss formation channels, merger rates, and theoretical models.
  • To summarize numerical techniques and simulation results.

Main Methods:

  • Review of theoretical predictions for merger rates.
  • Discussion of quasi-equilibrium formalisms for pre-merger dynamics.
  • Analysis of numerical techniques for dynamical simulations (relativistic, hydrodynamics, gravitational-wave extraction, microphysics).

Main Results:

  • Overview of current understanding of binary coalescence physics.
  • Summary of recent simulation results, including relativistic and microphysically detailed studies.
  • Identification of key orbital instability processes driving mergers.

Conclusions:

  • The field is advancing rapidly with new simulation capabilities.
  • Future gravitational-wave detectors and petascale computing will drive new discoveries.
  • Continued research is essential for interpreting gravitational-wave signals from neutron star mergers.