Gravitational-Wave Extraction from Neutron Star Oscillations: comparing linear and nonlinear techniques
Abstract
The main aim of this study is the comparison of gravitational waveforms obtained from numerical simulations which employ different numerical evolution approaches and different wave-extraction techniques. For this purpose, we evolve an oscillating, non-rotating polytropic neutron-star model with two different approaches: a full nonlinear relativistic simulation (in three dimensions) and a linear simulation based on perturbation theory. The extraction of the gravitational-wave signal is performed with three methods: The gauge-invariant curvature-perturbation theory based on the Newman-Penrose scalar ; The gauge-invariant Regge-Wheeler-Zerilli-Moncrief metric-perturbation theory of a Schwarzschild space-time; Some generalization of the quadrupole emission formula.
Cite
@article{arxiv.0808.4002,
title = {Gravitational-Wave Extraction from Neutron Star Oscillations: comparing linear and nonlinear techniques},
author = {Luca Baiotti and Sebastiano Bernuzzi and Giovanni Corvino and Roberto De Pietri and Alessandro Nagar},
journal= {arXiv preprint arXiv:0808.4002},
year = {2009}
}
Comments
27 pages, 18 figures. Published in Phys. Rev. D