2010/06/30 by A. Bauswein, Andreas Bauswein, Hans‐Thomas Janka +2 · 6 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astrophysics #Black hole (networking) #Component (thermodynamics) #Computational physics #Equation of state #Gamma-ray bursts and supernovae #Gravitational wave #High-pressure geophysics and materials #Ideal gas #Mechanics #Neutron #Neutron star #Nuclear physics #Observable #Oscillation (cell signaling) #Physics #Pulsars and Gravitational Waves Research #Quantum electrodynamics #Quantum mechanics #Thermal #Thermodynamics #Ultracold neutrons #astro-ph.SR #gr-qc
paper · pdf · doi:10.1103/physrevd.82.084043
published as Phys.Rev.D82:084043,2010 · 10 pages, 6 figures, 9 eps files; revised with minor additions due to referee comments; accepted by Phys.Rev.D
arxiv created 2010/10/15 · openalex publication_date 2010/10/26 · arxiv updated 2010/11/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We perform three-dimensional relativistic hydrodynamical calculations of neutron star mergers to assess the reliability of an approximate treatment of thermal effects in such simulations by combining an ideal-gas component with zero-temperature, microphysical equations of state. To this end we compare the results of simulations that make this approximation to the outcome of models with a consistent treatment of thermal effects in the equation of state. In particular we focus on the implications for observable consequences of merger events like the gravitational-wave signal. It is found that the characteristic gravitational-wave oscillation frequencies of the postmerger remnant differ by about 50 to 250 Hz (corresponding to frequency shifts of 2 to 8 percent) depending on the equation of state and the choice of the characteristic index of the ideal-gas component. In addition, the delay time to black hole collapse of the merger remnant as well as the amount of matter remaining outside the black hole after its formation are sensitive to the description of thermal effects.