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Statistical properties of astrophysical gravitational-wave backgrounds

Feb 25, 2014

9 pages

Published in:

Phys.Rev.D 89 (2014) 8, 084063

Published: Apr 17, 2014

e-Print:

1402.6231 [astro-ph.CO]

DOI:

10.1103/PhysRevD.89.084063

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Abstract: (APS)

We investigate how a stochastic gravitational-wave background, produced from a discrete set of astrophysical sources, differs from an idealized model consisting of an isotropic, unpolarized, and Gaussian background. We focus, in particular, on the different signatures produced from these two cases, as observed in a cross-correlation search. We show that averaged over many realizations of an astrophysical background, the cross-correlation measurement of an astrophysical background is identical to that of an idealized background. However, any one realization of an astrophysical background can produce a different signature. Using a model consisting of an ensemble of binary neutron star coalescences, we quantify the typical difference between the signal from individual realizations of the astrophysical background and the idealized case. For advanced detectors, we find that, using a cross-correlation analysis, astrophysical backgrounds from many discrete sources are probably indistinguishable from an idealized background.

04.30.-w
gravitational radiation: background
gravitational radiation: stochastic
gravitational radiation: emission
neutron star: binary: coalescence
neutron star: coalescence
signature
numerical calculations
correlation
statistical

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