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  Collapse of differentially rotating neutron stars and cosmic censorship

Giacomazzo, B., Rezzolla, L., & Stergioulas, N. (2011). Collapse of differentially rotating neutron stars and cosmic censorship. Physical Review D, 84(2): 024022. doi:10.1103/PhysRevD.84.024022.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-06C8-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-06C9-9
Genre: Journal Article

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 Creators:
Giacomazzo, Bruno1, Author              
Rezzolla, Luciano1, Author              
Stergioulas, Nikolaos, Author
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
 Abstract: We present new results on the dynamics and gravitational-wave emission from the collapse of differentially rotating neutron stars. We have considered a number of polytropic stellar models having different values of the dimensionless angular momentum J/M^2, where J and M are the asymptotic angular momentum and mass of the star, respectively. For neutron stars with J/M^2<1, i.e., "sub-Kerr" models, we were able to find models that are dynamically unstable and that collapse promptly to a rotating black hole. Both the dynamics of the collapse and the consequent emission of gravitational waves resemble the one seen for uniformly rotating stars, although with an overall decrease in the efficiency of gravitational-wave emission. For stellar models with J/M^2>1, i.e., "supra-Kerr" models, on the other hand, we were not able to find models that are dynamically unstable and all of the computed supra-Kerr models were found to be far from the stability threshold. For these models a gravitational collapse is possible only after a very severe and artificial reduction of the pressure, which then leads to a torus developing nonaxisymmetric instabilities and eventually contracting to a stable axisymmetric stellar configuration. While this does not exclude the possibility that a naked singularity can be produced by the collapse of a differentially rotating star, it also suggests that cosmic censorship is not violated and that generic conditions for a supra-Kerr progenitor do not lead to a naked singularity.

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 Dates: 2011-04-302011-07-072011
 Publication Status: Published in print
 Pages: 15 pages, 15 figures. Minor changes to the text and to the references. In press on Phys. Rev. D
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 Identifiers: arXiv: 1105.0122
DOI: 10.1103/PhysRevD.84.024022
URI: http://arxiv.org/abs/1105.0122
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Title: Physical Review D
  Other : Phys. Rev. D.
Source Genre: Journal
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Publ. Info: Lancaster, Pa. : Published for the American Physical Society by the American Institute of Physics
Pages: - Volume / Issue: 84 (2) Sequence Number: 024022 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258