Pau Amaro-Seoane , Sofiane Aoudia , Stanislav Babak , Pierre Binétruy , Emanuele Berti , Alejandro Bohé , Chiara Caprini , Monica Colpi , Neil J. Cornish , Karsten Danzmann , Jean-François Dufaux , Jonathan Gair , Oliver Jennrich , Philippe Jetzer , Antoine Klein , Ryan N. Lang , Alberto Lobo , Tyson Littenberg , Sean T. McWilliams , Gijs Nelemans , Antoine Petiteau , Edward K. Porter , Bernard F. Schutz , Alberto Sesana , Robin Stebbins , Tim Sumner , Michele Vallisneri , Stefano Vitale , Marta Volonteri , Henry Ward
03 February 2012
We review the expected science performance of the New Gravitational-Wave Observatory (NGO, a.k.a. eLISA), a mission under study by the European Space Agency for launch in the early 2020s. eLISA will survey the low-frequency gravitational-wave sky (from 0.1 mHz to 1 Hz), detecting and characterizing a broad variety of systems and events throughout the Universe, including the coalescences of massive black holes brought together by galaxy mergers; the inspirals of stellar-mass black holes and compact stars into central galactic black holes; several millions of ultracompact binaries, both detached and mass transferring, in the Galaxy; and possibly unforeseen sources such as the relic gravitational-wave radiation from the early Universe. eLISA's high signal-to-noise measurements will provide new insight into the structure and history of the Universe, and they will test general relativity in its strong-field dynamical regime.