Gravitational-wave extraction from neutron-star oscillations: Comparing linear and nonlinear techniques
Journal Article
·
· Physical Review. D, Particles Fields
- Graduate School of Arts and Sciences, University of Tokyo, Komaba, Meguro-ku, Tokyo, 153-8902 (Japan)
- Dipartimento di Fisica, Universita di Parma and INFN, Gruppo Collegato di Parma, via G. B. Usberti 7/A, 43100 Parma (Italy)
- Max Planck Institut fuer Gravitationsphysik, Albert-Einstein-Institut, Potsdam-Golm (Germany)
- Institut des Hautes Etudes Scientifiques, 91440 Bures-sur-Yvette (France)
- Italy
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 {psi}{sub 4}; the gauge-invariant Regge-Wheeler-Zerilli-Moncrief metric-perturbation theory of a Schwarzschild space-time; some generalization of the quadrupole emission formula.
- OSTI ID:
- 21259797
- Journal Information:
- Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 2 Vol. 79; ISSN PRVDAQ; ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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