Impacts of overlapping gravitational-wave signals on the parameter
  estimation: Toward the search for cosmological backgrounds
  Third-generation gravitational wave detectors, such as the Einstein Telescope
and Cosmic Explorer, will detect a bunch of gravitational-wave (GW) signals
originating from the coalescence of binary neutron star (BNS) and binary black
hole (BBH) systems out to the higher redshifts, $z\sim 5-10$. There is a
potential concern that some of the GW signals detected at a high statistical
significance eventually overlap with each other, and the parameter estimation
of such an overlapping system can differ from the one expected from a single
event. Also, there are certainly overlapping systems in which one of the
overlapping events has a low signal-to-noise ratio $\lesssim 4$, and is thus
unable to be clearly detected. Those system will potentially be misidentified
with a single GW event, and the estimated parameters of binary GWs can be
biased. We estimate the occurrence rate of those overlapping events. We find
that the numbers of overlapping events are $\sim 200$ per day for BNSs and a
few per hour for BBHs. Then we study the statistical impacts of these
overlapping GWs on a parameter estimation based on the Fisher matrix analysis.
Our finding is that the overlapping signals produce neither large statistical
errors nor serious systematic biases on the parameters of binary systems,
unless the coalescence time and the redshifted chirp masses of the two
overlapping GWs are very close to each other, i.e.,
$|\mathcal{M}_{z1}-\mathcal{M}_{z2}|\lesssim10^{-4} \,(10^{-1})\,M_\odot$ and
$|t_{\rm c1}-t_{\rm c2}|\lesssim10^{-2}\,(10^{-1})$\,s for BNSs (BBHs). The
occurrence rate of such a closely overlapping event is shown to be much smaller
than one per year with the third-generation detectors.
