Blandford's argument: The strongest continuous gravitational wave signal

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Knispel, B.; Allen, B.: Blandford's argument: The strongest continuous gravitational wave signal. In: Physical Review D - Particles, Fields, Gravitation and Cosmology 78 (2008), Nr. 4, 44031. DOI: https://doi.org/10.1103/PhysRevD.78.044031

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For a uniform population of neutron stars whose spin-down is dominated by the emission of gravitational radiation, an old argument of Blandford states that the expected gravitational-wave amplitude of the nearest source is independent of the deformation and rotation frequency of the objects. Recent work has improved and extended this argument to set upper limits on the expected amplitude from neutron stars that also emit electromagnetic radiation. We restate these arguments in a more general framework, and simulate the evolution of such a population of stars in the gravitational potential of our galaxy. The simulations allow us to test the assumptions of Blandford's argument on a realistic model of our galaxy. We show that the two key assumptions of the argument (two dimensionality of the spatial distribution and a steady-state frequency distribution) are in general not fulfilled. The effective scaling dimension D of the spatial distribution of neutron stars is significantly larger than two, and for frequencies detectable by terrestrial instruments the frequency distribution is not in a steady state unless the ellipticity is unrealistically large. Thus, in the cases of most interest, the maximum expected gravitational-wave amplitude does have a strong dependence on the deformation and rotation frequency of the population. The results strengthen the previous upper limits on the expected gravitational-wave amplitude from neutron stars by a factor of 6 for realistic values of ellipticity. © 2008 The American Physical Society.
License of this version: Es gilt deutsches Urheberrecht. Das Dokument darf zum eigenen Gebrauch kostenfrei genutzt, aber nicht im Internet bereitgestellt oder an Außenstehende weitergegeben werden.
Document Type: article
Publishing status: publishedVersion
Issue Date: 2008
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
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1 image of flag of Germany Germany 73 87.95%
2 image of flag of China China 3 3.61%
3 image of flag of United States United States 2 2.41%
4 image of flag of Russian Federation Russian Federation 2 2.41%
5 image of flag of Korea, Republic of Korea, Republic of 1 1.20%
6 image of flag of France France 1 1.20%
7 image of flag of Canada Canada 1 1.20%

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