naa a22 4500 510732143 CHVBK 20180411082956.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1134/S1063772913060012 doi (NATIONALLICENCE)springer-10.1134/S1063772913060012 Gravitational radiation during coalescence of neutron stars [Elektronische Daten] [A. Aksenov, V. Chechetkin] The coalescence of components of a binary star with equal masses (M 1 = M 2 = M ⊙) and moving in circular orbits is considered. The equation of state for degenerate neutrons is used, leading to the equation of state for an ideal gas. The initial model has zero temperature, corresponding to a polytrope with n = 1.5. To reduce the required computational time, the initial close binary is constructed using the self-consistent field method. The computations use Newtonian gas dynamics, but the back reaction of the gravitational radiation is taken into account in a PN2.5 post-Newton approximation, obtained using ADM formalism. This makes it possible to apply previous experienceof constructing high-order Godunov-type difference schemes, which are suitable for end-to-end calculations of discontinuous solutions of the gas-dynamics equations on a fixed Eulerian grid. The Poisson equations were solved using an original spherical-function expansion method. The 3D computations yielded the parameters of the gravitational signal. Near the radiation maximum, the strain amplitude is rh ∼ 4 × 104 cm, the power maximum is 4 × 1054 erg/s, and the typical radiation frequency is ≳1 kHz. The energy carried away by gravitational waves is ≳1052 erg. These parameters are of interest, since they form an inherent part of a rotational mechanism for the supernova explosion. They are also of interest for the planning of gravitational-wave detection experiments. Pleiades Publishing, Ltd., 2013 Aksenov A. Institute for Computer Aided Design, Russian Academy of Sciences, Moscow, Russia aut Chechetkin V. M.V. Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow, Russia aut Astronomy Reports Springer US; http://www.springer-ny.com 57/7(2013-07-01), 498-508 1063-7729 57:7<498 2013 57 11444 https://doi.org/10.1134/S1063772913060012 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913060012 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Aksenov A. Institute for Computer Aided Design, Russian Academy of Sciences, Moscow, Russia aut NATIONALLICENCE 700 1- Chechetkin V. M.V. Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, Moscow, Russia aut NATIONALLICENCE 773 0- Astronomy Reports Springer US; http://www.springer-ny.com 57/7(2013-07-01), 498-508 1063-7729 57:7<498 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer