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          Institute: MPI für Gravitationsphysik     Collection: Observational Relativity and Cosmology     Display Documents

ID: 359634.0, MPI für Gravitationsphysik / Observational Relativity and Cosmology
Blandford's Argument: The Strongest Continuous Gravitational Wave Signal
Authors:Knispel, Benjamin; Allen, Bruce
Date of Publication (YYYY-MM-DD):2008-08
Title of Journal:Physical Review D
Issue / Number:4
Sequence Number of Article:04431
Review Status:not specified
Audience:Not Specified
Abstract / Description:For a uniform population of neutron stars whose spin-down is dominated by the emission of gravitational radiation, an argument by 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 which also emit electromagnetic radiation. We restate these argments 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 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.
External Publication Status:published
Document Type:Article
Communicated by:Bruce Allen
Affiliations:MPI für Gravitationsphysik/Observational Relativity and Cosmology
MPI für Gravitationsphysik/Astrophysical Relativity
MPI für Gravitationsphysik/Teilinstitut Hannover
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0804.3075v2.pdf  [620,00 Kb] [Comment:arXiv:0804.3075v2 [gr-qc]]  
PRD78-2008.pdf  [585,00 Kb] [Comment:Online Journal]  
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