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  Gravitational wave background from rotating neutron stars

Rosado, P. A. (2012). Gravitational wave background from rotating neutron stars. Physical Review D, 86(10): 104007. doi:10.1103/PhysRevD.86.104007.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-232E-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0010-232F-9
Genre: Journal Article

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 Creators:
Rosado, Pablo A.1, Author              
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011              

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Free keywords: General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
 Abstract: The background of gravitational waves produced by the ensemble of rotating neutron stars (which includes pulsars, magnetars and gravitars) is investigated. A formula for \Omega(f) (commonly used to quantify the background) is derived, properly taking into account the time evolution of the systems since their formation until the present day. Moreover, the formula allows one to distinguish the different parts of the background: the unresolvable (which forms a stochastic background) and the resolvable. Several estimations of the background are obtained, for different assumptions on the parameters that characterize neutron stars and their population. In particular, different initial spin period distributions lead to very different results. For one of the models, with slow initial spins, the detection of the background can be rejected. However, other models do predict the detection of the background by the future ground-based gravitational wave detector ET. A robust upper limit for the background of rotating neutron stars is obtained; it does not exceed the detection threshold of two cross-correlated Advanced LIGO interferometers. If gravitars exist and constitute more than a few percent of the neutron star population, then they produce an unresolvable background that could be detected by ET. Under the most reasonable assumptions on the parameters characterizing a neutron star, the background is too faint. Previous papers have suggested neutron star models in which large magnetic fields (like the ones that characterize magnetars) induce big deformations in the star, which produce a stronger emission of gravitational radiation. Considering the most optimistic (in terms of the detection of gravitational waves) of these models, an upper limit for the background produced by magnetars is obtained; it could be detected by ET, but not by BBO or DECIGO.

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 Dates: 2012-06-062012-11-062012
 Publication Status: Published in print
 Pages: 25 pages, 15 figures
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 Rev. Method: -
 Identifiers: arXiv: 1206.1330
DOI: 10.1103/PhysRevD.86.104007
URI: http://arxiv.org/abs/1206.1330
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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: 86 (10) Sequence Number: 104007 Start / End Page: - Identifier: ISSN: 0556-2821
CoNE: /journals/resource/111088197762258