Digging deeper: Observing primordial gravitational waves below the binary black hole produced stochastic background

T. Regimbau , M. Evans , N. Christensen (1) , E. Katsavounidis , B. Sathyaprakash , S. Vitale

1 ARTEMIS - Astrophysique Relativiste Théories Expériences Métrologie Instrumentation Signaux

The merger rate of black hole binaries inferred from the detections in the first Advanced LIGO science run implies that a stochastic background produced by a cosmological population of mergers will likely mask the primordial gravitational wave background. Here we demonstrate that the next generation of ground-based detectors, such as the Einstein Telescope and Cosmic Explorer, will be able to observe binary black hole mergers throughout the Universe with sufficient efficiency that the confusion background can potentially be subtracted to observe the primordial background at the level of ΩGW≃10-13 after 5 years of observation.

Mots clés: 04.80.Nn; 04.25.dg; 95.85.Sz; 97.80.-d; black hole: binary; gravitational radiation detector; gravitational radiation: emission; gravitational radiation: primordial; gravitational radiation: background; background: primordial; background: stochastic; Einstein Telescope; efficiency; noise; KAGRA; LIGO

Domaines: Astrophysique [astro-ph]

T. Regimbau, M. Evans, N. Christensen, E. Katsavounidis, B. Sathyaprakash, et al.. Digging deeper: Observing primordial gravitational waves below the binary black hole produced stochastic background. Physical Review Letters, 2017, 118 (15), pp.151105. ⟨10.1103/PhysRevLett.118.151105⟩. ⟨hal-01554575⟩