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 (YYYYMMDD):  200808 
Title of Journal:  Physical Review D 
Volume:  78 
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 spindown 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 (twodimensionality of the spatial distribution and a steadystate 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

Identifiers:  LOCALID:arXiv:0804.3075 URL:http://arxiv.org/abs/0804.3075 ISSN:10894918 DOI:10.1103/PhysRevD.78.044031 
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