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Gravitational waves from cosmological double neutron star binaries can besignificantly demagnified by strong gravitational lensing effect, and theproposed future missions such as BBO or DECIGO might miss some of thedemagnified GW signals below a detection threshold. The undetectable binarieswould form a GW foreground which might hamper detection of a very weakprimordial GW signal. We discuss the outlook of this potential problem, using asimple model based on the singular-isothermal-sphere lens profile. Fortunately,it is expected that, for presumable merger rate of NS+NSs, the residualforeground would be below the detection limit Omega_{GW} ~ 10^{-16} realizedwith BBO/DECIGO by correlation analysis.

Demagnified GWs from Cosmological Double Neutron Stars and GW Foreground Cleaning Around 1Hz