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

Abstract

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

8 pages, 3 figures, to appear in PRD

References in corpus (3)

• The Sloan Digital Sky Survey Quasar Lens Search. III. Constraints on Dark Energy from the Third Data Release Quasar Lens Catalog
• Gravitational Waves from the First Stars
• Subtraction-noise projection in gravitational-wave detector networks

Cited by in corpus (4)

• Strong lensing of gravitational waves as seen by LISA
• Scientific Potential of DECIGO Pathfinder and Testing GR with Space-Borne Gravitational Wave Interferometers
• Impacts of overlapping gravitational-wave signals on the parameter estimation: Toward the search for cosmological backgrounds
• Gravitational-wave cosmological distances in scalar-tensor theories of gravity