Gravitational-Wave Extraction from Neutron Star Oscillations: comparing linear and nonlinear techniques

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dc.creatorBaiotti, Luca
dc.creatorBernuzzi, Sebastiano
dc.creatorCorvino, Giovanni
dc.creatorDe Pietri, Roberto
dc.creatorNagar, Alessandro
dc.date2008-08-28
dc.date2009-03-11
dc.date.accessioned2026-07-07T12:50:44Z
dc.date.available2026-07-07T12:50:44Z
dc.descriptionThe 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 $ψ_4$; The gauge-invariant Regge-Wheeler-Zerilli-Moncrief metric-perturbation theory of a Schwarzschild space-time; Some generalization of the quadrupole emission formula.
dc.description27 pages, 18 figures. Published in Phys. Rev. D
dc.identifierhttps://arxiv.org/abs/0808.4002
dc.identifierhttp://arxiv.org/abs/0808.4002
dc.identifierPhys.Rev.D79:024002,2009
dc.identifierdoi:10.1103/PhysRevD.79.024002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/222771
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.titleGravitational-Wave Extraction from Neutron Star Oscillations: comparing linear and nonlinear techniques
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