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 c4; the gauge-invariant Regge-Wheeler-Zerilli-Moncrief metric-perturbation theory of a Schwarzschild space-time; some generalization of the quadrupole emission formula.

Gravitational-Wave Extraction from Neutron Stars Oscillations: comparing linear and nonlinear techniques / L., Baiotti; Bernuzzi, Sebastiano; G., Corvino; DE PIETRI, Roberto; A., Nagar. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 79:(2009), pp. 024002-1-024002-27. [10.1103/PhysRevD.79.024002]

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

BERNUZZI, Sebastiano;DE PIETRI, Roberto;
2009-01-01

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 c4; the gauge-invariant Regge-Wheeler-Zerilli-Moncrief metric-perturbation theory of a Schwarzschild space-time; some generalization of the quadrupole emission formula.
2009
Gravitational-Wave Extraction from Neutron Stars Oscillations: comparing linear and nonlinear techniques / L., Baiotti; Bernuzzi, Sebastiano; G., Corvino; DE PIETRI, Roberto; A., Nagar. - In: PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY. - ISSN 1550-7998. - 79:(2009), pp. 024002-1-024002-27. [10.1103/PhysRevD.79.024002]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/1873308
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