Relativistic Calculations of Coalescing Binary Neutron Stars

Details Relativistic Calculations of Coalescing Binary Neutron Stars Relativistic Calculations of Coalescing Binary Neutron Stars

2004-03-02

arxiv.org/abs/astro-ph/0403074v1

Pramana63:837-844,2004

Astronomy and Astrophysics

Astrophysics

7 pages, proceedings of the ICGC 2004 meeting, to appear in Pramana

Scientific paper

10.1007/BF02705204

We have designed and tested a new relativistic Lagrangian hydrodynamics code, which treats gravity in the conformally flat approximation to general relativity. We have tested the resulting code extensively, finding that it performs well for calculations of equilibrium single-star models, collapsing relativistic dust clouds, and quasi-circular orbits of equilibrium solutions. By adding in a radiation reaction treatment, we compute the full evolution of a coalescing binary neutron star system. We find that the amount of mass ejected from the system, much less than a percent, is greatly reduced by the inclusion of relativistic gravitation. The gravity wave energy spectrum shows a clear divergence away from the Newtonian point-mass form, consistent with the form derived from relativistic quasi-equilibrium fluid sequences.

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