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The gravitational wave "probability event horizon" for double neutron star mergers  D. M. Coward
; M. Lilley
; E. J. Howell
; R. R. Burman
; D. G. Blair
;  Date: 
7 Oct 2005  Abstract:  Gravitational waves generated by the final merger of double neutron star (DNS) binary systems are a key target for the gravitational wave (GW) interferometric detectors, such as LIGO, and the next generation detectors, Advanced LIGO. The cumulative GW signal from DNS mergers in interferometric data will manifest as "geometrical noise": a noncontinuous stochastic background with a unique statistical signature dominated by the spatial and temporal distribution of the sources. Because geometrical noise is highly nonGaussian, it could potentially be used to identify the presence of a stochastic GW background from DNS mergers. We demonstrate this by fitting to a simulated distribution of transients using a model for the DNS merger rate and idealized Gaussian detector noise. Using the cosmological "probability event horizon" concept and recent bounds for the Galactic DNS merger rate, we calculate the evolution of the detectability of DNS mergers with observation time. For Advanced LIGO sensitivities and a detection threshold assuming optimal filtering, there is a 95% probability that a minimum of one DNS merger signal will be detectable from the ensemble of events comprising the stochastic background during 12211 days of observation. For initial LIGO sensitivities, we identify an interesting regime where there is a 95% probability that at least one DNS merger with signaltonoise ratio > unity will occur during 468 days of observation. We propose that there exists an intermediate detection regime with prefiltered signalnoiseratio less than unity, where the DNS merger rate is high enough that the geometrical signature could be identified in interferometer data.  Source:  arXiv, astroph/0510203  Services:  Forum  Review  PDF  Favorites 


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