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Journal Article

Gravitational-wave extraction from neutron-star oscillations: Comparing linear and nonlinear techniques

MPS-Authors

Baiotti,  Luca
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

Corvino,  Giovanni
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

De Pietri,  Roberto
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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prd79-024002.pdf
(Publisher version), 2MB

0808.4002v2.pdf
(Preprint), 2MB

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Citation

Baiotti, L., Bernuzzi, S., Corvino, G., De Pietri, R., & Nagar, A. (2009). Gravitational-wave extraction from neutron-star oscillations: Comparing linear and nonlinear techniques. Physical Review D, 79(02): 024002. doi:10.1103/PhysRevD.79.024002.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0013-4555-9
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, nonrotating, 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 via three methods: the gauge-invariant curvature-perturbation theory based on the Newman-Penrose scalar psi4; the gauge-invariant Regge-Wheeler-Zerilli-Moncrief metric-perturbation theory of a Schwarzschild space-time; some generalization of the quadrupole emission formula.