Year: 2013
Type: article
Abstract: The starting point of any general relativistic numerical simulation is a solution of the Hamiltonian and momentum constraints that (ideally) represents an astrophysically realistic scenario. We present a new method to produce initial data sets for binary neutron stars with arbitrary spins and orbital eccentricities. The method only provides approximate solutions to the constraints. However, we show that the corresponding constraint violations subside after a few orbits, becoming comparable to those found in evolutions of standard conformally flat, helically symmetric binary initial data. We evolve in time data sets corresponding to binaries with spins aligned, zero, and antialigned with the orbital angular momentum. These simulations show the orbital ``hang-up'' effect previously seen in binary black holes. Additionally, they show orbital eccentricities that can be up to 1 order of magnitude smaller than those found in helically symmetric initial sets evolutions.
Authors: Petr Tsatsin, Pedro Marronetti
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1997535956