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  Gravitational-Wave Emission from Rotating Gravitational Collapse in three Dimensions

Baiotti, L., Hawke, I., Rezzolla, L., & Schnetter, E. (2005). Gravitational-Wave Emission from Rotating Gravitational Collapse in three Dimensions. Physical Review Letters, 94: 131101.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4E7B-7 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-4E7C-5
Genre: Journal Article

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0503016.pdf (Preprint), 140KB
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 Creators:
Baiotti, Luca, Author
Hawke, Ian1, 2, Author
Rezzolla, Luciano2, Author              
Schnetter, Erik1, 2, Author
Affiliations:
1Geometric Analysis and Gravitation, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24012              
2Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:24013              

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 Abstract: We present the first calculation of gravitational wave emission produced in the gravitational collapse of uniformly rotating neutron stars to black holes in fully three-dimensional simulations. The initial stellar models are relativistic polytropes which are dynamically unstable and with angular velocities ranging from slow rotation to the mass-shedding limit. An essential aspect of these simulations is the use of progressive mesh-refinement techniques which allow to move the outer boundaries of the computational domain to regions where gravitational radiation attains its asymptotic form. The waveforms have been extracted using a gauge-invariant approach in which the numerical spacetime is matched with the non-spherical perturbations of a Schwarzschild spacetime. Overall, the results indicate that the waveforms have features related to the properties of the initial stellar models (in terms of their w-mode oscillations) and of the newly produced rotating black holes (in terms of their quasi-normal modes). While our waveforms are in good qualitative agreement with those computed by Stark and Piran in two-dimensional simulations, our amplitudes are about one order of magnitude smaller and this difference is mostly likely due to our less severe pressure reduction. For a neutron star rotating uniformly near mass-shedding and collapsing at 10 kpc, the signal-to-noise ratio computed uniquely from the burst is S/N ~ 0.25, but this grows to be S/N <~ 4 in the case of LIGO II.

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Language(s): eng - English
 Dates: 2005
 Publication Status: Published in print
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 Identifiers: eDoc: 204979
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Title: Physical Review Letters
Source Genre: Journal
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Pages: - Volume / Issue: 94 Sequence Number: 131101 Start / End Page: - Identifier: -